The best cleaner I have ever used is Nu-Brite Condenser Coil Cleaner. Works great, just as advertised. Easy to use, doesn't kill your grass or plants. After you mix it with water and spray it on, wait about 15 minutes. As long as you wet the coils pretty well, it foams like crazy. The grime and junk in / on your coils will ooze off. Great stuff, not a bad price either.
I lightly mist my condenser first, which really helps the cleaner travel on the coils and get all the junk.
I lightly mist my condenser first, which really helps the cleaner travel on the coils and get all the junk.