Do not use alcohol, as this is flammable and could start a fire. Do not use bleach, as those fumes are toxic and bleach could damage the unit. While safer than bleach or alcohol, hydrogen peroxide should still be clearly labelled and kept out of the reach of children.

Avoid getting spray in eyes or inhaling it. Once it settles on surfaces, the fumes are no longer a concern. Rinse hands after spraying.

Spraying when the unit is turned off for the night is ideal, as that allows plenty of time to dry before morning.

Place a drip tray underneath the unit to catch any drips, which might otherwise bleach carpet, fabric, or wood. A turkey basting tray is one possible option.

Depending on your model, you’ll either pull the filter up or slide it down out of its slot. Check your manual for specific information about how to remove your front panel and filter. [2] X Research source

It’s best to clean your filter at least once a month. Clean it more often if you live in a dusty environment or have pets. [4] X Trustworthy Source U. S. Department of Energy Official site for the U. S. Department of Energy, which provides resources related to energy safety, conservation, and efficiency Go to source Replace your air filter at least every 3 months. [5] X Expert Source Victor BelavusAir Conditioning Specialist Expert Interview. 6 May 2020.

Never run an air conditioner with a wet filter or without a filter.

If your unit has a universal foam filter, you can purchase a cut-to-fit air conditioner filter online or at your local home improvement store. [8] X Research source

The screws are small, so be sure to keep them in a safe place, like an envelope or small can.

Wearing work gloves when you clean the fins will prevent you from getting cut.

You can also use a small brush to wipe away debris from the coils. [12] X Expert Source Victor BelavusAir Conditioning Specialist Expert Interview. 6 May 2020.

Hand dry the tray with a clean towel then let it air dry for a few hours before reassembling the unit.

If you can’t remove the air conditioner from the window, cover the exterior portion of the unit with a tarp or cover designed for air conditioners.

Choose a warm, sunny day to deep clean your air conditioner outside.

Let the parts soak for about 10 minutes.

Avoid getting the control panel wet when you hose down the unit.