How To Clean A Dehumidifier (6 Easy Steps) - Oh So Spotless

If you ignore your dehumidifier, it eventually becomes a breeding ground for mold. A dirty unit loses efficiency, works harder, and drives up your electricity bill.

You need to clean your dehumidifier regularly to keep the air in your home healthy. Unfortunately, user manuals can be vague or hard to follow.

We have broken this down into a simple six-step method. Follow this guide to prevent musty odors and keep your machine running smoothly for years.

Key Takeaways

• Clean the air filter every two weeks to maintain airflow and energy efficiency.
• Scrub the water tank monthly with warm water and dish soap; use white vinegar to kill mold.
• Vacuum the intake grilles and coils regularly to prevent dust buildup and overheating.
• Always unplug the unit before cleaning and allow all parts to dry completely before reassembly.

In This Article

• Why Clean Your Dehumidifier?
• How Often Should You Clean It?
• Cleaning Your Dehumidifier
• FAQs

Why Clean Your Dehumidifier?

You might be shocked at how much filth a dehumidifier collects. It pulls in air, moisture, and dust simultaneously. If left unchecked, that mixture turns into sludge.

A dirty air filter chokes the machine. This forces the motor to work harder, which shortens its lifespan and wastes energy.

More importantly, a neglected water tank is a perfect home for mold and bacteria. If mold grows in the tank, the dehumidifier can blow spores back into your room. That defeats the purpose of having the unit in the first place.

How Often Should You Clean It?

Dehumidifiers need routine maintenance. We recommend a light cleaning (filter and tank rinse) every two weeks during heavy use.

Perform a deep cleaning, including the exterior and bucket scrubbing, once a month.

How to Clean a Dehumidifier

Dehumidifiers have a few key components, like the filter, reservoir, and grilles, that need attention. Let’s get to work.

• Time: 20 minutes (plus drying time).
• Difficulty: Easy.

What You’ll Need

• Microfiber cloths.
• Dish soap.
• Warm water.
• Small scrubbing brush (or toothbrush).
• Distilled white vinegar.
• Spray bottle.
• Vacuum with brush attachment.

1. Unplug the Unit

Safety first. Always turn the machine off and unplug it from the wall outlet before you start. You will be using water, and you do not want to risk electric shock.

2. Clean the Exterior

The outer shell captures large dust bunnies and debris before they enter the machine.

Use a dry cloth to wipe down the main housing. Pay special attention to the air intake and exhaust grilles. These vents often get clogged with dust.

Use your vacuum’s brush attachment to suck loose dust out of the grilles. If the plastic is sticky or grimy, wipe it down with a damp cloth and a drop of dish soap.

Keep In Mind

Never spray water or cleaning solutions directly onto the main unit. Liquid can seep into the electrical components and destroy the motor.

3. Scrub the Tank

The reservoir (bucket) collects water, but it also collects slime. If you feel a slick film on the bottom of the bucket, that is a biofilm starting to form.

Remove the tank and empty the water. Fill it about halfway with warm water and a few drops of dish soap. Use a sponge or brush to scrub the bottom and sides.

If you smell mildew or see dark spots, you need to disinfect. Fill the tank with a 1:1 mixture of water and white vinegar. Let it sit for 20 minutes to kill the bacteria. Rinse it thoroughly and dry it with a clean cloth.

If your dehumidifier drains through a hose, check the line for clogs. Pour some undiluted vinegar through the hose to clear out any mold buildup.

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Why White Vinegar?

White vinegar is a powerful, food-safe disinfectant. While some people use bleach to kill mold, bleach can damage plastic and release harsh fumes. We prefer to use vinegar for safer, effective cleaning (1).

4. Wash the Filter

The air filter is your dehumidifier’s first line of defense. Consult your user manual to locate it. It is usually behind the intake grille or right above the water tank.

Slide the filter out and inspect it. If it is ripped or damaged, you must replace it.

If it looks good, run a vacuum over it to remove heavy dust. Next, wash it in a sink filled with warm, soapy water. Rinse it gently under the tap.

Shake off the excess water and let the filter air dry completely. Never put a wet filter back into the machine; moist filters attract mold immediately.

Check Your Manual

Most modern dehumidifiers have washable permanent filters. However, some older or specific models use disposable filters. Check your guide to ensure you don’t ruin a disposable filter with water.

5. Check the Bucket Filter

Some dehumidifiers have a tiny secondary filter inside the bucket near the drain hole. This catches small particles so they don’t clog the drain hose.

If your unit has one, pop it out and rinse it with warm water. If it is clogged, use a soft toothbrush to gently clear the mesh.

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6. Reassemble and Test

Once the bucket, filter, and exterior are clean and completely dry, put everything back together.

Plug the dehumidifier in and turn it on. Listen for the fan and compressor to kick on. Check the digital display for any error codes. Let it run for 30 minutes to ensure it is collecting water and blowing warm, dry air.

FAQs

What Is the Brown Stuff in My Dehumidifier?

The brown sludge is usually a mix of dust, airborne skin cells, and mold spores (often Cladosporium). This creates a biofilm that thrives in the wet environment of the water tank. Clean it immediately with vinegar to prevent it from spreading.

How Many Years Do Dehumidifiers Last?

A well-maintained dehumidifier typically lasts between five and ten years. If you never clean the filter or coils, the compressor overheats, which can cause the unit to fail in as little as two years.

How Often Should I Empty the Water Bucket?

You should empty the bucket daily, or whenever it gets full. Standing water is a breeding ground for bacteria. If you leave water sitting in the tank for days, it will start to smell and grow mold.

How Often Should You Change the Filter in a Dehumidifier?

If you have a washable filter, you rarely need to “change” it unless it tears; just wash it every two weeks. If your unit uses disposable filters, replace them every 3 to 6 months, or more often if you have pets or smoke indoors.

How Do You Get the Musty Smell Out of a Dehumidifier?

A musty smell means mold is hiding somewhere. Deep clean the tank with undiluted white vinegar and let it soak. Also, check the fan blades and coils (through the vents) for dust buildup. If the smell persists, the mold may be deep inside the motor housing.

Why Is My Dehumidifier Freezing Up?

Freezing usually happens because airflow is restricted. A dirty air filter or clogged intake grille prevents warm air from passing over the cold coils. Clean the filter and vacuum the grilles. If it continues to freeze, the room might be too cold (under 65°F) for the unit to operate efficiently. Feedback: Was This Article Helpful? 👍 👎 Thank You For Your Feedback! Share Pin Thank You For Your Feedback! What Did You Like? Informative Easy to Understand Engaging Submit What Went Wrong? Inaccurate Missing Information Outdated Submit