Cleaning and Maintenance of the Donner Touchless Dispenser

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Cleaning and maintenance of the contactless dispenser Donner – complete practical guide

A contactless soap dispenser is one of those bathroom helpers that most people don't think about until something stops working. The dispenser stops reacting to hands, starts dispensing too little or too much, leaks its contents onto the shelf, or simply gets stuck in the middle of dispensing. In almost all cases, this is due to neglected maintenance – not an electronic malfunction, not a dead battery, not a product defect. With five years of experience in customer service in the field of sanitation and bathroom accessories, I can confidently say that nine out of ten dispenser complaints would never arise if the device were regularly and properly cleaned.

This article is exclusively about the topic of cleaning and maintenance of models from the Donner contactless dispenser range. You will find specific procedures for different types of dirt, a guide for decarbonizing the pump, tips for long-term storage, recommendations for commercial operations and households, as well as common mistakes people make during maintenance that ultimately cause more damage than the neglect itself.

Why dispenser maintenance is different from maintenance of other bathroom accessories

Most bathroom items – soap dish, soap cup, hooks – are cleaned simply: wipe with a damp cloth and that's it. A contactless dispenser is different because it is a combination of several components with different cleaning requirements. It has electronics sensitive to moisture, a mechanical pump prone to soap drying, a sensor area that can lose sensitivity when dirty, and a container in which soap can decompose or become contaminated after weeks.

Another thing to understand: a contactless dispenser does not dispense water. It works with soap, gel or disinfectant – substances that have consistency, glycol, surfactants and sometimes antimicrobial additives. These substances when in contact with air dry, form a crust, crystallize and clog. If the dispenser has been on the shelf continuously for two years and you have never opened it, you will most likely find hardened soap residue in the pump that resembles a piece of glue.

Cleaning frequency – how often and what exactly

The first question customers ask is: "How often do you actually need to clean it?" The answer depends on three factors – the type of soap you use, the intensity of use, and whether it is a household or commercial operation (restaurant, hotel, clinic, office).

Household with standard liquid soap

With a standard liquid soap solution in a household (average family, 4 people), the following schedule applies:

Every week: Wipe the outside surface of the dispenser with a damp soft cloth. Check the outlet adapter – whether there is a dried layer of soap on it. If yes, gently wipe the adapter dry with a cotton swab slightly dampened with water.
Every month: Perform a short rinse of the pump with clean water (procedure below). Check the level of soap and if the tank is almost empty, rinse the tank before refilling with a new dose.
Every 3 months: Complete cleaning – disassembly of the pump, rinsing of the tank, checking of seals and the sensor. This is a key action that prevents most malfunctions.
Once a year (or when changing the type of soap): Deep cleaning with the pump immersed in warm water, checking of batteries or USB connection, checking of the entire mechanism.

Commercial operation and high intensity of use

In operations where the dispenser serves dozens or hundreds of people a day (receptions, restaurants, medical facilities), the cleaning frequency is multiplied. The outer surface must be cleaned daily. The outlet adapter should be checked every 2–3 days. Complete cleaning of the pump and tank should be carried out monthly. With disinfectant gel solutions (high alcohol content), rinsing the pump after each tank refill is almost a necessity, as alcohol accelerates the crystallization of residue.

The model Donner MOUNT Black without drip has proven itself in commercial practice precisely because its design without a drip tray eliminates one of the typical problem points – the accumulation of soap residue in the drip tray. This does not mean that cleaning is not necessary – the pump and outlet adapter are subject to the same physical laws as with other models.

Cleaning the outer surface – what to use and what to avoid

The outer plastic or ABS composite from which Donner dispensers are made is resistant to common cleaning agents, but has its limits. For daily cleaning, a soft damp cloth is sufficient. If there are larger deposits of soap on the surface, slightly dampen the cloth with warm water (40–50 °C) and let it act on the dried area for 20–30 seconds – the soap coating will soften and can be easily wiped away.

What never to use on the outer surface:

Aggressive organic solvents (acetone, thinner, technical alcohol above 70 %) – they dull and damage the plastic surface.
Abrasive sponges or wire brushes – they scratch the polished surface and create micro-scratches, on which soap sticks much easier.
Chlorine bleach (sodium hypochlorite) in its pure form – it can damage the joints and color of the body with prolonged contact.
Spray cleaning agents directly sprayed on the dispenser – there is a risk of penetration into the sensor window or power port.

The sensor area – usually a transparent window or a shiny panel on the lower part of the device – should be cleaned separately. Use a dry or only slightly damp cloth. Never use cleaning agents containing ammonia or aggressive alcohols on the sensor window – they can cloud it and the dispenser will stop reacting. If you have doubts about why the dispenser is not reacting to hands, check the cleanliness of the sensor window first – in practice, a dirty sensor area is much more common a cause of a non-responding device than a dead battery.

Pump cleaning – the heart of the whole dispenser

The pump is the most mechanically complex part of the entire device and also the part where clogging occurs most frequently. The principle is simple: a piston pushes soap from the tank through the outlet channel. After each dispensing, a small amount of soap remains in the piston and channel. If the dispenser is not used for a long time, this residual layer dries and reduces the channel's cross-section – sometimes to the extent that the pump is no longer able to fully push out the contents.

Quick rinse (monthly maintenance)

This procedure takes less than five minutes and significantly extends the life of the pump:

Turn off the dispenser or remove the batteries (for Donner MIST Liquid Bílý, check where the batteries are located – usually in the rear panel).
Fill the tank up to 1/4 with warm (not boiling) clean water.
Turn the dispenser back on and activate the dispensing several times (5–8 ×) – either manually (if the model allows it) or by holding your hand in front of the sensor.
The warm water will flush the pump channel and wash away soft soap deposits.
Empty the remaining water from the tank, rinse the tank, and refill it with fresh soap.

Note: do not use distilled water for rinsing, as it has no ionic composition and can cause slight swelling of certain types of rubber seals. Ordinary tap water (hardness 8–15 °F) is ideal.

Deep pump cleaning (quarterly maintenance)

This task requires pump disassembly. The procedure varies by model, but for most Donner dispensers, it involves turning and pulling out the pump unit from the device body (usually a 1/4 turn to the left). If you are unsure about disassembly, I recommend reading the article Step-by-step installation of the Donner touch-free dispenser from the Knowledge Center, where the process is detailed.

After removing the pump:

Submerge the pump unit in a container with warm water (50 °C) and let it soak for 15–20 minutes. You will see yellowish soap deposits coming out of it.
Scrub the outside of the pump and the outlet hole gently with an old toothbrush (don't throw away old brushes – they work very well for dispenser maintenance).
Use a thin cleaning rod or a pipe cleaner to clean the internal channel – move it through the channel several times.
Rinse the pump under running water, tap it several times on the palm (with the cap facing down) – this simple method removes remaining water and deposits from the channel.
Before reassembly, let the pump dry in the air for at least 30 minutes. Never install a wet pump – condensation inside the device body is a risk.

Tank cleaning – preventing contamination and odor

At first glance, the tank seems easy to clean – it's just a plastic container. In reality, it's more complicated. Soap (especially liquid soaps with a natural base) is subject to microbial contamination if it sits in the tank for too long. Moldy soap in tanks is not a myth – at temperatures above 25 °C and typical bathroom humidity, bacteria can multiply in the soap solution if it is poorly preserved or diluted.

Never dilute soap with water in the dispenser tanks – it's the most common mistake people make. Although the soap becomes less viscous and flows better, the concentration of preservatives and the pH of the solution are simultaneously reduced, which dramatically shortens its biological shelf life. Within two weeks, you could have soap with beginning contamination in such tanks.

Tank cleaning procedure

Perform this procedure every time you refill after complete emptying (and always when changing the brand or type of soap):

Pour out any remaining old soap (if any).
Fill the tank halfway with warm water, close it, and shake it vigorously several times.
Pour out the water through the pump opening (disengage the pump and press it manually) – this also rinses the lower part and the pump inlet.
If the tank is visibly discolored or has an unpleasant odor, add a drop of regular dish soap to the warm water and repeat the procedure.
Final rinse: rinse the tank twice with clean water without soap.
Let the tank stand open for at least one hour before refilling it with fresh soap.

Important: never put the tank in a dishwasher. Plastic parts can deform at temperatures above 60 °C, and seals can be damaged by aggressive dishwasher tablets.

Special case: Gel and disinfectant dispenser

Models designed for gel soaps or disinfectants – such as Donner MIST Gel Bílý – require a gentler, yet more thorough approach to cleaning. Gel soaps have a higher viscosity than liquid soaps, which means that dried gel residue forms more quickly in the pump and is harder to remove. Alcohol-based disinfectants additionally accelerate the evaporation of moisture from the residue with each dispensing, leaving behind a dry, sticky base.

Specific recommendations for gel dispensers:

Rinse with warm water every 3 weeks, not every month.
If the dispenser is not used for more than 5–7 days (e.g., during a vacation), it is recommended to flush the pump with water before leaving and after returning.
To remove hardened gel deposits in the channel, use a solution of warm water with a few drops of vinegar (apple cider or white kitchen vinegar). Acetic acid gently dissolves hardened gel residue without damaging the plastic. Let it sit for 10 minutes, then rinse with clean water.
Never fill the gel tank with disinfectants containing alcohol concentration above 80 % without reading the dispenser's specifications – high alcohol content can damage certain types of seals.

The topic of choosing the right content for different types of dispensers is discussed in detail in the article Touchless Gel Dispenser vs. Liquid Soap – What is Better in our Knowledge Center.

Cleaning a non-drip dispenser – special recommendations

Non-drip dispensers have a special check valve at the outlet that prevents dripping of soap residue after dispensing. This valve is a brilliant feature, but it has one weak spot: since it is a small mechanical element with a very narrow opening, it is particularly prone to clogging by dried soap. If you notice that the dispenser starts dripping or, conversely, dispenses in bursts with pauses – it is almost always a partially clogged check valve.

Cleaning the check valve:

Remove the outlet cap (usually unscrews or slides out).
The valve is usually a small ball or membrane at the end of the outlet – you can see it when looking into the cap.
Soak the cap in warm water for 10–15 minutes.
Gently blow through the cap from both sides with your mouth – you will notice whether the air passes in both directions (it should only pass in one – when blowing from the back).
If the valve is still clogged, use a thin needle (not a sharp rod – to avoid damaging the membrane) and very gently loosen the valve ball.

A more detailed description of how this mechanism works can be found in the article Non-drip Dispenser – When is it Worth it and How it Works in the Knowledge Center.

Care for electronics and power supply during cleaning

This is an area where most people don't think until cleaning damages the electronics. The rule is simple and absolute: disconnect the dispenser from the power supply before any wet cleaning. In battery-powered models, remove the batteries. In USB models, unplug the cable.

Check the battery compartment during every battery change – look for corrosion on the contacts (white or greenish coating). Corroded contacts can be cleaned with a cotton swab dampened with 70 % technical alcohol (not more). If the corrosion is extensive, gently sand the contacts with 600 grit (fine) sandpaper, then treat them with conductive vaseline.

Clean the USB port with compressed air or a soft cloth. Never insert metal objects into the port – you may damage the contacts. If the USB port does not accept the cable, check whether there is soap residue inside – gently wipe it with an almost dry cotton swab.

More about the differences in power supply for various Donner models can be found in the article Battery Power vs. USB – Which Version Suits You.

Long-term storage – when you put the dispenser away for the season

A situation we often encounter in cottages, mountain chalets, or seasonal businesses: the dispenser is not used for several months. If you simply leave it with soap inside, you will almost certainly face a clogged pump or spoiled soap when you put it back into operation.

Correct procedure before long-term storage:

Pour out all the soap from the tank.
Perform a complete rinse of the tank and pump with warm water (see the procedure above).
Clean the outlet cap.
Let the entire dispenser, including the pump and tank, dry thoroughly – ideally for 24 hours in the air at room temperature.
Remove the batteries (for battery-powered models) – this prevents battery leakage during long-term storage.
Store the dispenser in a dry, shaded place. Do not expose it to freezing or direct sunlight.

When putting the dispenser back into operation after the winter break: even if the interior seems dry, perform a rinse with clean water before refilling with soap – dust particles or microbial contamination from the air may have settled inside.

Setting the dispensing amount and its impact on clogging

Few people realize that an incorrectly set dispensing amount directly affects the rate of clogging. If the dispenser delivers too much soap, the excess drips from the hands onto the body of the dispenser, runs down the outlet, and leaves stains. If it dispenses too little, people tend to activate it multiple times in succession – and each unnecessary hand movement near the sensor causes micro-droplets that settle on the sensor and its surroundings.

The optimal amount of liquid soap for a single hand wash is 1.0–1.5 ml. For gel soap preparations, it can be slightly lower – 0.7–1.0 ml. If you are unsure whether the dose is correct, measure it: hold a small measuring syringe or cup under the outlet and count how many milliliters are dispensed with one activation. Most Donner models allow you to adjust the dose volume by rotating the adjustment element near the sensor or in the settings.

Common mistakes when cleaning Donner dispensers and their consequences

We know from practice several recurring mistakes that customers make when cleaning:

Cleaning with power connected: Short circuit risk due to contact of water with electronic components. Result: damaged control board, non-functional dispenser.
Submerging the entire dispenser in water: Dispensers are not waterproof (they do not have IP67/IP68 certification). Submersion will damage the electronics.
Using WD-40 or other oils on the pump: Oils are incompatible with soap solutions, form emulsions, clog the pump even more and after some time cause breakdown of rubber seals.
Too aggressive cleaning of the sensor: Damaging the sensor window causes permanent loss of sensitivity – the sensor will start dispensing randomly or will not react at all.
Not allowing enough drying time before reassembly: A wet pump in a closed device = condensation and mold growth in the tank, corrosion of contacts.
Mixing different types of soaps in the tank: Different soaps may be chemically incompatible, form precipitates and clog the pump. Always clean the tank before changing the brand or type of soap.

If you find yourself in a situation where the dispenser is not working properly even after cleaning, I recommend the article Common faults of touchless dispensers and their solutions in our Knowledge Center.

Examples from practice – what we have actually seen

Example No. 1 – Restaurant, two-shift operation: A restaurant with one dispenser at the sink in the kitchen. After four months, the pump stopped dispensing. Cause: soap was diluted with water (the cook did it "so it would last longer"), the diluted mixture solidified and the residue after each use dried into a thin layer – this layer accumulated on the thin membrane of the check valve, completely blocking it. Solution: deep cleaning of the valve, flushing, changing the procedure – since then, soap is no longer diluted.

Example No. 2 – Cabin, winter break: The customer complained that the dispenser "only dispenses air" after winter. Cause: the dispenser was left with soap in the tank, the soap froze and after thawing it formed a flocculent mass. The flocculent clogged the entire piston system of the pump. Solution: complete disassembly, submerging the pump in 60 °C water, dissolving the sediment, reassembly and flushing. Conclusion: always drain the dispenser before winter.

Example No. 3 – Regular household, dispenser with disinfectant: The customer bought a dispenser for disinfectant gel during the pandemic and after a year noticed that the dispenser was dispensing larger amounts than before. Cause: disinfectant alcohol damaged the piston seal – the rubber slightly expanded and in combination with the swollen rubber of the check valve, the dispensed amount increased. Solution: replacement of the piston rubber seal (available as a service part for some models). Conclusion: use a dispenser certified for alcohol-based solutions for disinfection.

Most frequently asked questions about cleaning Donner dispensers

Can I use chlorine bleach to disinfect the tank?

Chlorine bleach (sodium hypochlorite) can be used in a very diluted solution – maximum 0.5 % (i.e. 5 ml of bleach in 1 liter of water) for a short-term tank rinse (up to 5 minutes). At higher concentrations or longer contact, damage to the plastic tank and rubber seals is possible. Never leave bleach in the tanks as a "disinfecting filler" – it will damage the pump. After using bleach, rinse the tank with clean water at least 3 times.

Dispenser still does not react to hands after cleaning – what next?

If the sensor window is clean, batteries are new (or USB is connected) and the pump is mechanically functional, the problem may be in the sensitivity setting of the sensor. Check the manual for your model – most Donner dispensers allow resetting the settings by holding the button for 5–8 seconds. If the reset does not help, the problem may be a faulty IR sensor – this topic is covered in the article Common faults of touchless dispensers and their solutions.

How long does it take for the pump to work properly again after cleaning?

After deep cleaning and refilling with soap, the pump may need 3–5 activations to "prime" the system – that is, to push the air out of the suction channel and replace it with soap. This is normal behavior. If the dispenser still does not dispense soap after 10 attempts, check whether the pump is correctly mounted and locked in the body of the dispenser.

Can I clean the pump unit in the dishwasher?

No. Dishwasher temperatures (55–70 °C) and aggressive tablet detergents damage the rubber seals of the pump and can deform thin-walled plastic parts. Clean the pump manually in warm water (max. 55 °C) with mild soap or clean water only.

How long will a Donner dispenser last with proper maintenance?

With proper cleaning schedule, a realistic lifespan is 5–8 years for home use. In commercial practice with intensive use and regular monthly maintenance, it is 3–5 years. The most common parts to wear out prematurely are the pump seal (replaceable as a service part) or the sensor (due to contamination). Electronics usually outlast the pump when handled properly.

My soap has dried in the pump so much that I cannot remove it – what now?

Submerge the entire outlet bracket with the pump (the part that can be separated from the body of the dispenser) in warm water (50–55 °C) for 30–45 minutes. Most soap deposits will dissolve at this temperature enough to allow the pump to be slowly turned – gentle turning while submerged. Never use force or pliers – you may break the plastic pump suspension. If soaking for a long time does not help, try a solution of warm water and vinegar (1:3).

Conclusion – maintenance is not optional, it is an investment

The touchless Donner dispenser is a precision device that will work reliably for years without major expenses when properly maintained. Cleaning is not a complicated procedure – when incorporated into a routine, monthly rinsing takes less than five minutes and quarterly deep cleaning less than half an hour. For this small investment of time, you will get a device that will never leave guests with soap halfway through washing, never leak onto the shelf, and never dispense hardened remnants of old gel.

If you are considering buying a new dispenser and cannot decide between models, I recommend reading the article How to choose a touchless soap dispenser for the bathroom and Donner line: overview of models and their differences in our Knowledge Center. And if you have doubts about the tank capacity and refill frequency, be sure to also check the topic Tank volume and dosing capacity – what to watch out for. With the right model choice and regular maintenance, your Donner dispenser will be a reliable assistant for years to come.

Do you have a question about this topic?

Having trouble deciding or dealing with a specific situation in your household? Write to us – we are happy to help.