How to Clean a Dehumidifier [A Complete Step-by-Step Guide]

Are you noticing your dehumidifier isn’t working as well as it used to? Maybe there’s a musty smell coming from it, or it’s making strange noises. Don’t worry—it probably just needs a good cleaning! I’ve been maintaining dehumidifiers for years, and I’m here to walk you through exactly how to get your machine running like new again.

A clean dehumidifier works more efficiently, lasts longer, and creates a healthier environment in your home. In this guide, I’ll show you exactly how to clean every part of your dehumidifier properly, from the water bucket to those hard-to-reach coils.

Why Regular Cleaning of Your Dehumidifier Matters

Before we dive into the cleaning process, let’s talk about why this maintenance task shouldn’t be pushed to the bottom of your to-do list.

Health Benefits of a Clean Dehumidifier

Did you know that a neglected dehumidifier can actually make your air quality worse instead of better? Ironic, isn’t it? When dust, mold, and bacteria build up inside your dehumidifier, the machine can end up circulating these allergens throughout your home.

This is particularly concerning for anyone with allergies, asthma, or other respiratory conditions. By keeping your dehumidifier clean, you’re not just maintaining an appliance—you’re protecting your family’s health.

Efficiency and Longevity Benefits

A dirty dehumidifier works harder and uses more electricity to do the same job. When components like the coils and filter get clogged with dust and debris, airflow is restricted, and the machine has to run longer to remove the same amount of moisture.

Regular cleaning can:

• Reduce your energy bills
• Extend the lifespan of your dehumidifier by years
• Maintain optimal performance
• Prevent unexpected breakdowns

Think of it like changing the oil in your car—a simple maintenance task that saves you money in the long run.

Essential Tools and Supplies for Cleaning Your Dehumidifier

Before you start the cleaning process, gather these supplies to make the job easier and more effective.

Basic Cleaning Supplies

• Mild dish soap or detergent
• White vinegar (for disinfecting)
• Soft cloths or microfiber towels
• Soft brush (an old toothbrush works perfectly)
• Vacuum with brush attachment
• Spray bottle
• Clean, dry towels

Optional Deep-Cleaning Tools

• Compressed air can (for hard-to-reach dust)
• Small soft brush (for coil cleaning)
• Cotton swabs (for tight spaces)
• Hydrogen peroxide (for stubborn mold)

Having these supplies ready before you begin will make the cleaning process much smoother and faster.

Before You Begin: Safety Precautions

Safety first! Always follow these precautions before cleaning your dehumidifier:

1. Unplug the unit completely—never clean a dehumidifier that’s still connected to power
2. Allow the unit to sit unplugged for at least an hour if it’s been running (this gives internal components time to dry)
3. Work in a well-ventilated area, especially when using cleaning products
4. Consider wearing gloves if you have sensitive skin or allergies
5. Consult your dehumidifier’s manual for any specific cleaning instructions or warnings

Remember that electricity and water don’t mix, so always err on the side of caution.

Step-by-Step Guide to Cleaning Your Dehumidifier

Now that you’re prepared, let’s break down the cleaning process into manageable steps.

Step 1: Powering Down and Unplugging

Before doing anything else, turn off your dehumidifier and unplug it from the wall. This is a crucial safety step that should never be skipped. If your unit has been running recently, give it time to cool down before proceeding.

Sometimes I like to place a towel beneath the unit at this point, as there might be some water spillage during the cleaning process.

Step 2: Emptying and Cleaning the Water Bucket

The water collection bucket is one of the most important parts to clean regularly:

1. Carefully remove the bucket according to your model’s instructions
2. Dump out any collected water
3. Fill the bucket with warm water and a few drops of mild dish soap
4. Using a soft cloth, scrub all interior surfaces, paying special attention to corners and seams
5. For stubborn mineral deposits (often appearing as white residue), add a cup of white vinegar to warm water and let it soak for 15-20 minutes
6. Rinse thoroughly with clean water
7. Dry completely with a clean towel before reinserting

A clean water bucket prevents mold growth and those unpleasant musty smells that can develop over time.

Step 3: Removing and Cleaning the Air Filter

The air filter prevents dust and debris from entering your dehumidifier’s internal components:

1. Locate and remove the air filter (usually at the back or side of the unit)
2. If your filter is reusable (most are), take it to a sink or bathtub
3. Gently vacuum the filter first to remove loose dust
4. Wash it with warm water and mild soap, gently scrubbing with your fingers
5. Rinse thoroughly until water runs clear
6. Allow the filter to air dry completely before reinstalling (this is crucial to prevent mold growth)

Some models have filters that need replacing rather than cleaning. Check your manual to be sure, but typically, if the filter looks damaged or doesn’t come clean after washing, it’s time for a replacement.

Step 4: Cleaning the Exterior Housing

Don’t forget about the outside of your dehumidifier:

1. Dampen a soft cloth with water and mild soap
2. Wipe down all exterior surfaces, paying special attention to air intake and output grilles
3. For stubborn dirt, use a soft brush (like an old toothbrush) to gently scrub
4. Wipe away soapy residue with a clean, damp cloth
5. Dry thoroughly with a clean towel

While cleaning the exterior, check for any cracks or damage that might affect performance or safety.

Step 5: Cleaning the Water Collection System and Internals

This step varies depending on your dehumidifier model, but generally:

1. Locate and remove any detachable water collection components
2. Soak them in a solution of equal parts white vinegar and water for 10-15 minutes
3. Gently scrub with a soft brush to remove any buildup
4. Rinse thoroughly and dry completely

For internal areas you can access but not remove:

1. Dampen a cloth with the vinegar-water solution
2. Carefully wipe down accessible surfaces
3. Use cotton swabs for tight spaces

Always refer to your user manual before disassembling any parts not designed for regular cleaning.

Step 6: Addressing Mold and Mildew Issues

Finding mold in your dehumidifier can be concerning, but it’s a common issue with moisture-collecting appliances.

Mild Mold Situations

For light mold growth:

1. Create a solution of one part white vinegar to one part water
2. Apply to moldy areas using a spray bottle
3. Let sit for 10-15 minutes
4. Scrub gently with a soft brush
5. Wipe clean and dry thoroughly

Severe Mold Problems

For more extensive mold:

1. Mix a solution of 1/4 cup hydrogen peroxide in 1 cup of water
2. Apply to affected areas and let sit for 15 minutes
3. Scrub with a soft brush
4. Rinse thoroughly
5. Dry completely

If mold keeps returning or covers large areas, it might be time to consider replacing your dehumidifier, as extensive mold can be difficult to completely eliminate and may pose health risks.

Deep Cleaning Your Dehumidifier Coils

The coils in your dehumidifier are where the magic happens—they condense moisture from the air. Keeping them clean is essential for efficiency.

How to Access the Coils

Accessing the coils typically requires some disassembly:

1. Consult your user manual for specific instructions
2. Usually, you’ll need to remove the outer housing with a screwdriver
3. Take photos as you go to help with reassembly
4. Be careful not to bend or damage the delicate coils

If you’re uncomfortable opening up your dehumidifier, consider having it professionally serviced instead.

Cleaning Methods for Coils

Once you can access the coils:

1. Use a vacuum with a soft brush attachment to gently remove dust
2. For stubborn dirt, use a soft brush specifically designed for coil cleaning (available at most hardware stores)
3. If your manual permits, you can use a commercial coil cleaner following package directions
4. Alternatively, a gentle spray of water and vinegar solution followed by careful brushing can work well
5. Allow coils to dry completely before reassembling

Never use high-pressure water or air on coils, as they can be easily damaged.

Maintenance Schedule: How Often to Clean Different Parts

Creating a regular cleaning schedule will keep your dehumidifier running smoothly:

• Daily/Every Few Days:
  • Empty the water bucket (more frequently in very humid conditions)
• Every Two Weeks:
  • Wipe down the exterior
  • Check and clean the air filter
  • Clean the water bucket thoroughly
• Monthly:
  • Check for mold and mildew in accessible areas
  • Clean the water collection system
• Seasonally (3-4 times per year):
  • Deep clean all components
  • Check coils and clean if accessible
  • Inspect for any damage or wear

Mark these tasks on your calendar or set reminders on your phone to help you remember.

Troubleshooting Common Issues After Cleaning

Sometimes you might encounter issues after cleaning your dehumidifier:

• Dehumidifier won’t turn on:
  • Ensure it’s properly plugged in
  • Check that the water bucket is correctly seated (many units have safety switches)
  • Make sure all components are completely dry before powering on
• Unusual noises:
  • Check for loose parts or foreign objects
  • Ensure the unit is on a level surface
  • Listen for “normal” sounds vs. problematic ones (some humming is normal)
• Not collecting water:
  • Confirm humidity levels are high enough to need dehumidification
  • Check that nothing is blocking air intake or output
  • Ensure filter is clean and properly installed
• Leaking water:
  • Check that the water bucket is properly aligned
  • Look for cracks in the bucket or collection system
  • Ensure the unit is on a level surface

If problems persist after cleaning, it might be time to consult a professional or consider a replacement.

When to Consider Professional Cleaning or Replacement

Even with regular maintenance, there comes a time when DIY cleaning isn’t enough:

• Consider professional cleaning if:
  • You notice persistent mold issues
  • The unit isn’t performing well despite regular cleaning
  • You’re uncomfortable accessing internal components
  • Your dehumidifier requires specialized cleaning tools or techniques
• Signs it might be time for replacement:
  • The unit is more than 5-7 years old
  • Repairs would cost more than 50% of a new unit
  • It’s running constantly but not reducing humidity effectively
  • You notice electrical issues or burning smells

Remember, a dehumidifier is an investment in your home’s air quality and structure—sometimes replacement is the most cost-effective long-term solution.

Eco-Friendly Cleaning Solutions for Your Dehumidifier

If you prefer to avoid harsh chemicals, try these natural alternatives:

• White vinegar: Nature’s disinfectant, perfect for mineral deposits and mild mold
• Baking soda: Great for scrubbing without scratching
• Lemon juice: Works well on mineral deposits and leaves a fresh scent
• Hydrogen peroxide: Natural disinfectant for more serious mold issues
• Essential oils (like tea tree or lavender): Add a few drops to your cleaning solution for antimicrobial properties and pleasant scent

These natural options can be just as effective as commercial cleaners while being better for your health and the environment.

Frequently Asked Questions

1. How often should I clean my dehumidifier?

You should perform basic cleaning (emptying the water tank, wiping down the exterior, and checking the filter) every two weeks during regular use. Deep cleaning should be done every 3-4 months, or more frequently if you notice any performance issues or unusual odors.

2. Can I use bleach to clean my dehumidifier?

While bleach is an effective disinfectant, it’s generally not recommended for dehumidifiers as it can be harsh on components and potentially release fumes when the unit runs. White vinegar or hydrogen peroxide are safer alternatives that still provide antimicrobial benefits without risking damage to your unit.

3. Why does my dehumidifier smell bad even after cleaning?

If odors persist after cleaning, you might have missed mold growth in hard-to-reach areas like the internal coils or drainage system. Try a more thorough deep cleaning focusing on these areas. In some cases, persistent odors might indicate it’s time for a professional cleaning or replacement.

4. Is it normal for my dehumidifier to collect less water after cleaning?

Actually, a clean dehumidifier should work more efficiently, not less. If you’re noticing decreased water collection after cleaning, check that all components are properly reassembled and that nothing is blocking airflow. Also consider that seasonal changes in humidity levels naturally affect how much water is collected.

5. What should I do with my dehumidifier when not in use for extended periods?

Before storing your dehumidifier for the season, give it a thorough cleaning, ensuring all components are completely dry. Store it in a clean, dry place covered with a breathable material to prevent dust accumulation. When you’re ready to use it again, clean it once more before turning it on to remove any dust or debris that accumulated during storage.

Conclusion

A clean dehumidifier is key to maintaining healthy air quality and protecting your home from excess moisture. By following this step-by-step guide, you’ll not only extend the life of your appliance but also ensure it’s working efficiently to create a comfortable, healthy environment.

Remember, regular maintenance is much easier than dealing with a completely clogged or moldy unit—a little effort every few weeks will save you time, money, and headaches in the long run. Your lungs (and your wallet) will thank you!