- Time
- One visit
- Product
- Aerosure AC Foam Cleaner 500 mL
- Never
- Pressure washer on fins
- Power
- On only when dry
Step 1: Power off and expose the coil
Switch off the AC and isolate the electrical supply. Open the access panel to expose the evaporator coil. Protect nearby electrical components from moisture, and wear gloves and eye protection.
Step 2: Remove loose dirt
Use a soft brush or a vacuum to remove loose dust and debris. Always brush in the direction of the fins, so you do not bend them.
Step 3: Apply AC Foam Cleaner
Shake the can well. Spray Aerosure AC Foam Cleaner evenly across the coil, holding the nozzle at the distance on the label. Let the foam penetrate between the fins and work on the dirt. Do not spray electrical components.
Step 4: Rinse or drain, then restore
Follow the product's rinse or no-rinse instructions. If rinsing is needed, use gentle, low-pressure water, never a high-pressure washer. Let the water drain completely. Refit the panel and restore power only when the area is safe and dry.
Common mistakes
- Skipping power isolation because the job is quick.
- Spraying foam into the control board or motor.
- Using a pressure washer, which bends fins and pushes water where it should not go.
- Switching on before the unit is dry.
Watch the eight-step 3D walkthrough on the Aerosure page.
Products used
Quick answers
Can I clean an AC coil without a pressure washer?
Yes. A foaming coil cleaner such as Aerosure AC Foam Cleaner penetrates between the fins and loosens dirt. If the label calls for a rinse, use gentle low-pressure water.
Is it safe to spray foam cleaner on AC electrical parts?
No. Switch off and isolate power, protect electrical components from moisture and keep the foam off them.
When can I switch the AC back on after cleaning?
Only after excess water has drained, the panel is refitted and the area is safe and dry.