The Penguin evaporator coils are enclosed in a sheet metal cover. In the diagram it looks like that cover can be easily removed
while standing on the roof so the cooling fins can be accessed. My plan is to remove that cover and using compressed air at
low psi, blow the dirt out through the fins from inside the coach. Blowing inward would mean a lot of crap getting inside, and
using water isn't an option.
I have tried cleaning the fins with a toothbrush from inside and it's "in your face" dirty.......................plus you're only cleaning 1/2
a layer.
Maybe someone has a better idea.
The blue rubberized horse hair that I used as a filter, (along with the dryer sheets for aesthetics and fragrance) worked really
well judging by the colors of the front and back. The stuff that's needs cleaned out of the fins was there when I bought the
MH.
I wouldn't use compressed air because the fins on these units are extremely soft and fragile. I bought a fin comb kit off Amazon and use it along with a HVAC cleaner spray which I have to climb up onto the roof to use. 4 screws hold the AC cover on and can be removed quickly. You might grab some aluminized tape to make sure that everything is sealed up and there aren't any air leaks while you are up there. It works well and I have to do it about every 3 months (fulltimer).
Amazon.com: Robinair 18403 Fin Straightener: Automotive (http://www.amazon.com/Robinair-18403-Fin-Straightener/dp/B002BHRXJ6/ref=sr_1_17?ie=UTF8&qid=1455835138&sr=8-17&keywords=hvac+comb)
Amazon.com - Foam Coil Cleaner - 19 ounce spray aerosol can: Cleans Evaporato... (http://www.amazon.com/gp/product/B007I7KZN0?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00)
T-Man,
I successfully cleaned the coils in both of our units without too much trouble. I purchased a can of foaming coil cleaner from Home Depot and a plastic nozel for flushing/cleaning RV water heater tanks. Nozel is about 12 inches long and 1/4 dia or smaller. I fixed an inline hose valve to it to control the spray/water volume. I removed the inside and outside covers to expose the coils. I stuffed an old towel in from below to catch any overspray into the coach. Good idea to place another towel or mat under the ac being worked on just in case. Then to the roof with foam cleaner and water hose with nozel attached. I sprayed the foam on exposed coil surfaces and let it set for a few minutes. While waiting I located the drain holes in each end of the drain pan under the coil and flushed the pan and drain holes. It takes only a little spray to rinse the foam away and you must be careful not to overflow the drain pan, so slow going is a must. I used a toothbrush on a few areas then repeated the foam and rinse. The coil and pan were bright and clean so reassembled, sealing (caulk) the metal coil cover. No more "wet dog" odor...just clean fresh air from our units. If your careful and don't overflow the drain pan there is little mess. And during the peak of summer, I remove the interior cover and simply spray the exposed side (dirty side) of the coil to keep it clean, does not require rinsing. That's how I did it...hope it will help you in getting yours clean.