how to clean evap coil on carrier a/c unit
1 Mix warm water and a simple detergent in a spray bottle, hand sprayer or garden sprayer. 2  Apply the water and detergent solution to the evaporator coils. 3  Give the solution a few seconds to a few minutes to soak in and loosen debris.4  Reapply as needed. 5  Wipe away the loose material with a soft cloth or brush.f necessary, check your A/C ownerâs manual to locate the access panel and evaporator coil. 1  Turn the air conditioner off at the thermostat. 2  Remove the screws or other fasteners to loosen the access panel. 3  Place the panel and screws aside where they wonât get lost or separated.