Nu-Calgon 417175 Evap Foam

I had very very dirty coils on an older RV. The coal area is probably 18 x 20“. I had to apply this three times and ended up using the whole can. It does foam as it’s supposed to. You do need to use some water to rinse it. If you put the water in a spray bottle and just spray it, it does break the debris down. I don’t know how gentle or abrasive it is. It was on the top of aluminum trailer and when it came down, it did leave some streaks. Use caution rent immediately off your trailer for staining.

this foam saved a window A/C that i was going to trash....i was at my wits end about what to try next to clean it without doing damage....so i took a chance of this expensive foam.....i used the whole can on one unit spraying it right into the radiator that i positioned facing up, and just let it sit .... and after a few hours the foam was gone and unit was dry.....so i resprayed the radiator and saturated it with foam until the can was empty and just let it sit overnight .... foam went away and unit dried itself.... and its been working ever since

The foam worked noticeably well for cleaning. After using it, the unpleasant odor was much better than before, although it did not disappear completely. There is still a slight smell, but the improvement was obvious enough that I do think the product works. My main complaint is the price. This is an 18 oz can, and I think it is fairly expensive for the amount you get, especially since one cleaning did not completely eliminate the odor. Overall, the foaming cleaner made a real difference and I would use it again when needed, but I would be happier with it at a lower price.

As the self professed DIYer around my house, I wanted to improve cooling efficiency for my HVACs. I picked up this 2 pack of evaporator coil cleanser and got to work. It’s easy to spray on, doesn’t have to be rinsed off, and did the job well. Overall very easy to use and I plan to work this into my regular house maintenance schedule in the future!

I have been using Nu-Calgon products for a long time and like the quality they provide. The foaming action works very well for me and the smell is very clean and fresh. Using this cleaner is something everyone should use to keep their A/C evaporator clean and working efficiently. It is an alkaline cleaner that is safe on metal and contain corrosion inhibitor’s. It is also NSF registered so it can be used around food processing equipment.

Worked great to clean air conditioner. Great smelling too!

The reviews by some is correct the foam starts out foaming good but after sparying for a little while it doesn't foam as well or spray. A lot residue tends to run out the nozzle and down the can. But it does have a nice lemon scent.

This was recommended to me by my furnace repairman. Very easy to use. You can watch it push debris out of the coils. The AC is noticeably colder. Definitely would recommend.