Arm & Hammer Biodegradable HVAC and Air Conditioner Coil Cleaner Foam Aerosol Spray, 19 fl. oz, AHCC-19 by Diversitech

Worked great - got soooo much out. It's easy and it's strangely satisfying to spray on and watch it pull stuff out. The window A/C unit runs better and no longer occasionally shoots out little bits of dust and things that got past the filters. I did multiple rounds (plus spray bottle with very warm water between rounds) and there is still some left for a future cleaning. The smell is also nice - a fresh orange scent that isn't overwhelming and isn't 'chemical-y'

Really works great. Cleans coils without having to use a brush that can damage the coil fins. Just spay on let sit for 5min no rinse needed. Has a nice fresh scent that doesn't take your breath away with a strong chemical smell.

Good product at a good price! I applied the spray to the A/C coils and it cleaned them as advertised! You could really see the difference! I will buy this again!

It works really well to clean the foils

Did a great job Cleans efficiently and effectively

Had a ridiculous amount of buildup on the evaporator coils in my internal AC unit. The buildup was that greasy, black sticky gunk reinforced with fine dog hair that had escaped my plenum air filters. Bought one can of this foaming cleaner per side of the A-frame and applied liberally, first on the top-side (which was clean, but the hope was to have it flow through and loosen the gunk from the bottom), let it sit for about fifteen minutes. Then went back and sprayed the underside of the coils, using about half the can per side. Let sit for about fifteen minutes and came back to a noticeably cleaner set of coils. Repeated this process and saw a huge difference. I would call this foamer very effective, easy to use, and a good value for the price. Do note: You will want to use eye protection and wear sleeves when you apply this foam. It does burn a bit when it hits your skin, it is irritating if you breathe it in (so a respirator or good quality mask isn't a bad idea), and you'll want to consider gloves. You DO NOT want to get this in your eyes. Also, make sure you have a gallon or so of vinegar on standby. The gunk that melts/falls off will get collected and condensate water will flush it down your drain line. You won't want it to clog your line, so flushing it with vinegar during and shortly after the process is a good idea.

Also great for cleaning and deodorizing a vehicles AC evaporator. I use this every time before I replace the air filters on my Tesla Model 3. It effectively removes any odors the AC system may be producing and cleans any dirt off the evaporator. This product also foams up a lot which ensures my entire evaporator is coated in the cleaning solution. After about 10-15 minutes the foam dissipates and drains out of the AC drain underneath the car. Although rinsing is not needed, I usually spray water onto the evaporator afterwards to rinse it off. Then I wait overnight and then drop in the new filters. With 19oz vs a 6oz Kool-It bottle, at the same price, this is the evaporator cleaner to buy!

What a lifesaver, it definitely makes a difference in demolding. There are some molds that are really tight. Just a quick spray and it's alot easier.