Quality Chemical Nu-Coil Professional Grade Concentrated/Air Conditioner Alkaline Condenser Coil Cleaner for AC Unit/AC Coil Cleaner 1 Gallon (128 oz)[Amazon-developed Certification] Compact by Design

I use this to clean and degrease aluminum automotive, motorcycle, and marine parts instead of it's intended use as a coil cleaner. I've used it on aluminum sterndrives, outboards, flame arrestors, engines, cylinder heads, suspension parts, radiators, condensers, unpainted wheels... more stuff than I can even remember. It foams up quickly and lifts corrosion and contamination from aluminum parts, leaving a nice clean surface.As far as using this on HVAC coils, I would not advise this at all on commercial or residential coils as they are typically way too thin - especially now that the EPA has essentially mandated they last only a handful of years - to dare risk it. It would be almost impossible to ensure removal of all of this product, and what is left behind will continue to eat the coils. Even if you do manage to successfully remove every last vestige of this cleaner from the coils, they will be thinner as a result of this caustic cleaner. For my own home unit I just use a mild soapy solution and water. For automotive AC and engine cooling systems, I don't worry about spraying this on the outside to clean it because the coils are made far thicker than residential and commercial HVAC equipment.I have applied this with both a 2-gallon wand type garden sprayer as well as a 1/2 quart spray bottle, and I don't dilute it.This product is a very alkaline mixture of water and sodium hydroxide (lye, caustic soda). While this makes it far less dangerous than the acidic cleaners that contained hydrofluoric acid, it should still be treated with all due respect. You're essentially messing with drain cleaner here! Be sure to wear chemical resistant gloves when working with this product, as well as proper eye protection! Don't breathe the vapors emitted from this stuff when it's actively reacting with the aluminum!

It says it’s foaming. I mix as directions said. Got no foaming at all. But that’s Ok. It worked so well cleaning my condenser coils. Really pleased with the product.Wish I would have taken a picture before and after cleaning the coils.

The cleaner worked wonderfully. My condenser had algae growing on the inside and it disappeared using this cleaner.

My AC unit is years over due for a cleaning. I used this stuff with a coil sprayer from Coil Guys that hooks onto a hose. Others said it didn’t foam, but oh man did it ever. Maybe you just need the sprayer. Anyways, it did a nice job. A couple cautions. One I got some of the concentrate on my forearm and didn’t wash it off because it is “non-acid”. Half an hour later I felt a searing burning and looked and I my flesh was changing color. I got a minor chemical burn. Turns out this is Caustic Lye, i.e. sodium hydroxide. It's very dangerous stuff. This wasn't clear from the bottle. Wear large glove and especially eye protection. If you get this in your eyes, it could cause permanent damage. Second, there was so much foam in and around the unit that it took about 40 mins to thoroughly dilute it all and wash it away. I didn’t want the dog getting into it. Total mess. So be ready for that.

My dad used this product to clean out my 10 year old AC and now it’s working great and circulating more air

So, this is not a high foaming product. If you want that ace foam n clean is the best I have used but it's hard to find. On the other hand this product does clean fairly well, even takes algae off the outside of the unit effortlessly. I do prefer a high foaming product over this though

Worked perfectly. Easy to use.

Worked great last year, expect same results