You can clean coil with toothbrus soft hand . not to force too Much which can damage aluminum fins .
If you are talking about the outdoor unit, just spray water on your coil and then some simple green on the coil, let it sit for 10 minutes then thoroughly rinse off the coil making sure not to bend over the aluminum coil fins. If you are talking about the indoor coil, that is not consumer accessible for cleaning. You need to strip the sheet metal iff the coil to gain access which is difficult since you have the refrigerant lines leading in. If you do try to clean and strip it VERY carefully. If you puncture the refrigerant lines out side or the coil inside, you'll need to have an HVAC professional repair, evacuate, and recharge the system
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