I use the spray can of coil cleaner too. Rinsing it away with a water hose can get messy and get water inside the coach. I used a garden sprayer filled with tap water(high pressure, low volume) to rinse the coils after the cleaner had loosened the dirt and muck in the fins. Be gentle working around the coils, the fins bend very easily; bent fins equal reduced cooling capacity/efficiency. This worked fine for me, hope it does for others too.
Clean the drain pans, insure drain holes are all open, wipe solid surfaces with a vinegar-wetted rag- it cleans the surface, kills mold/mildew.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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