How to Clean a Dehumidifier (Without Damaging It)

A dehumidifier is one of the most reliable appliances you can have for maintaining healthy air quality and preventing mould in your home. But like any hardworking machine, it needs regular maintenance to work effectively—and that includes cleaning.

In this guide, we’ll walk you through how to clean a dehumidifier safely and correctly. We’ll highlight the most common areas where dirt and mould build up, explain what happens if you neglect them, and show you the right way to keep your unit running smoothly without damaging it.

 

Why Cleaning Your Dehumidifier Matters

 

 

Your dehumidifier is constantly filtering air and collecting excess moisture—two tasks that naturally attract dust, mould spores, and bacteria. Without regular cleaning, these pollutants build up inside the unit, leading to:

 

• Reduced efficiency

• Bad odours

• Higher electricity bills

• Possible mould recirculation into your home

 

Most importantly, improper cleaning methods—like using the wrong chemicals or soaking the unit—can cause permanent damage to the internal parts. That’s why knowing how to clean it correctly matters just as much as cleaning it regularly.

 

How Often Should You Clean Your Dehumidifier?

 

A good rule of thumb is:

 

• Empty and rinse the water tank: every 1–2 weeks

• Clean the air filter: every 2–4 weeks

• Deep clean (including coils and vents): once a month

 

You should also clean your unit immediately if you notice:

 

• A musty or sour smell

• Slower moisture removal

• Visible dust or grime inside the tank or vents

 

Where Do Dirt and Mould Build Up in a Dehumidifier?

 

 

Understanding where dirt collects can help you clean more effectively.

 

1. Water Collection Tank

 

This is where excess moisture accumulates—and also where bacteria and mould thrive if left standing too long. You may notice slime, discolouration, or a foul smell if not cleaned frequently.

2. Air Filter

 

The air filter traps dust, pollen, and debris. Over time, it clogs, reducing airflow and making the machine work harder than it should.

3. Coils and Internal Components

 

Moisture plus dust equals grime. Dirty coils reduce cooling efficiency and may cause condensation inside the unit.

4. Exterior Vents and Fan Blades

 

Dust on vents and blades can disrupt airflow, increase noise, and lead to overheating.

 

Step-by-Step: How to Clean a Dehumidifier Safely

 

 

Follow these steps to clean your dehumidifier without damaging it:

Step 1: Turn Off and Unplug the Unit

 

Always start by disconnecting the power. This prevents any risk of electric shock or internal damage.

Step 2: Clean the Water Tank

 

• Empty any standing water

• Use warm water with mild detergent or a white vinegar solution

• Scrub gently with a soft brush or sponge

• Rinse thoroughly and let it dry completely

 

Avoid using bleach or harsh chemicals—they can degrade plastic parts and leave harmful fumes.

Step 3: Clean or Replace the Air Filter

 

• Remove the filter (check your manual for instructions)

• If washable, rinse under cool water until clean

• Air dry completely before reinserting

• If it’s a disposable filter, replace it with the recommended type

Step 4: Wipe Down the Exterior and Air Vents

 

• Use a soft, damp microfiber cloth

• Pay attention to vents, fan blades, and edges

• Do not spray water directly into any opening

Step 5: Clean the Coils (if accessible)

 

• Use a soft brush or vacuum with a brush attachment to gently remove dust

• For sticky buildup, lightly dampen the brush—but never let water drip inside

Coils are delicate, so avoid using metal tools or excessive force.

Step 6: Let Everything Dry Before Reassembling

 

Moisture in the wrong place can short-circuit the machine. Make sure all components are fully dry before turning it back on.

 

What Not to Do When Cleaning a Dehumidifier

 

• Don’t use bleach or ammonia: They can corrode internal parts and release toxic fumes.

• Don’t submerge any part of the electrical housing.

• Don’t scrub coils with hard bristles or metal tools.

• Don’t reassemble while parts are still wet.

 

What Happens If You Don’t Clean It Properly?

 

Failing to clean your dehumidifier leads to:

 

• Mould buildup and airborne spores

• Musty or foul-smelling air

• Reduced water collection

• Overheating or motor strain

• Higher electricity usage

• A shorter product lifespan

 

Tips to Keep Your Dehumidifier in Top Condition

 

• Use in well-ventilated rooms

• Avoid placing it near walls or curtains

• Store in a dry place when not in use

• Stick to a cleaning schedule

• Use distilled water if recommended by the manufacturer

 

Conclusion: A Clean Dehumidifier is a Healthy Dehumidifier

 

Keeping your dehumidifier clean doesn’t take long—but the benefits are long-lasting. Regular maintenance improves efficiency, protects your air quality, and extends the life of your appliance.

Whether you already own a dehumidifier or are planning to buy one, we recommend choosing models that are easy to clean and maintain—like those from Newentor UK.

 

Shop Easy-to-Clean Dehumidifiers at Newentor

 

Newentor dehumidifiers are designed with removable tanks, washable filters, and intuitive maintenance features—making cleaning a breeze.
👉 Explore Our Dehumidifiers Here