Take a spray bottle (hand sprayer or garden sprayer), and put a mixture of water and any light detergent in it. Spray the solution on the evaporator coils and wait for some time. The solution will slowly loosen the debris, which you can remove using a cloth piece.
If you are looking for professional AC maintenance in Las Vegas, NV, look no further than Pioneer Air. For effective solutions to any HVAC-related issues, call us today at (702) 831-4840.