Arm & HammerBiodegradable HVAC and Air Conditioner Coil Cleaner Foam Aerosol Spray, No Rinse, 19 fl. oz, AHCC-19 by Diversitech

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.

This stuff worked great! The coils look like new! Just spray it on. It foams up. And the condensate automatically rinses them.

It did a nice job on my AC coils! Cleaned them really good!

Easy to use and works great!😊

This HVAC cleaning spray made a noticeable difference—my vents are cleaner and the air smells much fresher. It’s easy to use and doesn’t leave any residue. A simple way to improve air quality at home. Definitely recommend! Heat level down and great value.

It cleaned my Mini Splits very well and smells great. I can’t take strong odor or smell so if you have an issue with that, I recommend this product.

This stuff works really good. I used it on my mini splits and it was easy to use and worth the cost.

Works okay enough. But it was difficult to aim between the grill on my window unit AC in order to hit the indoor coils. If you miss and hit the grill the foam immediately expands to block your shot, preventing the foam from reaching deeper.It did work and now my AC smells fresh though.