Cleaning Air Conditioner Coils - Overhead unit

[Retired and Happy]

I haven't been able to locate a discussion on this topic...basement - yes, but not overhead. Looking up past the filter, my coil in the front air conditioner is pretty gunky. The rear unit probably is too, but I haven't looked yet. Is there a reasonable way to clean the coil without getting the whole inside of the rig wet?

I was going to start with a good vacuuming with a fairly soft brush. I've read about some coil cleaners, but they all seem to need a water flush after they do their work. There's also some wires up there which probably shouldn't get wet. Do you just kill the power, put down a lot of drop cloths, and go ahead and spray? It looks like the direction the air moves, the spray should come from the backside, or outside, of the coil. Am I missing something?

[Retired and Happy]

I haven't been able to locate a discussion on this topic...basement - yes, but not overhead. Looking up past the filter, my coil in the front air conditioner is pretty gunky. The rear unit probably is too, but I haven't looked yet. Is there a reasonable way to clean the coil without getting the whole inside of the rig wet?

I was going to start with a good vacuuming with a fairly soft brush. I've read about some coil cleaners, but they all seem to need a water flush after they do their work. There's also some wires up there which probably shouldn't get wet. Do you just kill the power, put down a lot of drop cloths, and go ahead and spray? It looks like the direction the air moves, the spray should come from the backside, or outside, of the coil. Am I missing something?

[RV Wizard]

Ken, there are foaming coil cleaning products on the market that will do a nice job but I do not know what effects it will have on the roof or side walls of the coach. I removed my air conditioner and claned them a few years ago and then reinstalled them. I would recommend using a non acid type cleaner and use lots of water around the air conditioner to keep the roof and walls wet. SOme of the cleaners will rinse out on a highly humid day from the condinsation removed by the evaporator coil. Do any others have some ideas?