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joshpit2003 posted on r/airconditioners1w
Buy yourself some evaporator coil cleaner (2-pack): https://www.amazon.com/dp/B0CHN2T5LV?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 To do it right, you will want to unplug and remove the entire unit outside, take the cover off, and clean both coils thoroughly then hose off with water (via a cheap hand-pump-sprayer or a medium-nozzle hose). Avoid wetting the electronics. Don't mess up the fins (or you can spend time fixing them with a fin-comb or small flathead screwdriver). Spray / vacuum logically so that you are expelling the dirtier side and not cramming more gunk into the fins. Airflow when operating tells you which side is dirtier.