Frost King ACF19 Foam Coil Cleaner, 1.18 Pound (Pack of 1), 19 Ounce

I bought this to clean the coils on my air conditioner, and it did an excellent job. The foam expands well, clings to the coils, and loosens dirt and grime without requiring a lot of scrubbing. It was simple to apply, and the light lemon scent was much more pleasant than I expected. After cleaning, I noticed better airflow and my A/C seemed to cool more efficiently. One can covered a good amount of surface, making it a great value for routine maintenance. If you're looking for an easy way to help keep your air conditioner running efficiently, this cleaner is definitely worth having on hand.

Awesome product and will definitely buy again! Easy to use, comes with a brush that you only need to use if your coils are extra dirty like mine were. Mostly you just need to spray it on and let it do its job. I sprayed the foaming cleaner on the first time and used the brush to break apart the heavier dirt, then rinsed with a spray bottle of water. The 2nd time I just sprayed on the foaming cleaner and let it pull the rest of the dirt down. Get this if your AC coils are dirty or just as a yearly maintenance! Smells great too!

My husband uses this foam coil cleaner for his RV, and it has worked well for keeping the coils clean. The foaming action provides good coverage and helps loosen dirt and buildup with minimal effort. The size is convenient for storing in the RV, and the can feels durable and well made. The color and appearance are as expected, and we like that it is gentle enough for regular cleaning without being overly harsh. Overall, it is easy to use, foams well, works effectively, and is a good value for the price.

When summer strikes, this is my go-to for keeping my wall AC's evaporator coil clean. It foams up nice and thick, which, I suppose, helps keep its chemistry in contact with the fins for as long as possible. While my wall AC is pretty far away from my kitchen, and I don't do that much frying, I can't help getting some of those aerosolized oil particles stuck in the fins. I also have cats, so some of the dander makes it past my filter, and Frost King helps sort that all out. I love that I can use the cap as a brush. This is super useful. The aroma is pleasant and it cost me $6.37 for 19 ounces in July 2026. I've recommended this product to others. I haven't yet cleaned the condenser coils, but one of these days I'll brave the climb of a rickety ladder in pursuit of maximum frigidity. Stay cool out there!

My window ac unit is about 2 years old and had never been cleaned with a product such as this. Just cleaned the filter every week or so. I noticed the carpet around the front interior of the AC unit was soaking wet, and did some research. I learned it was due to the coils freezing often and the exterior of the ac unit was green and absolutely FILTHY DIRTY!! So I came across this foam coil cleaner, ordered it and sprayed every inch of this ac unit inside and out. I let it sit for about 20 minutes before turning it back on. It was super easy to use and sprayed directly where I pointed it. I like the cap it came with. It helped me push some of the foam inside and in between the coils. My ac unit is small, an 6000 btu Toshiba. I definitely over sprayed the unit lol so I only have about a 1/4 of the bottle remaining. Had i have known how well this works, I definitely could've made it last longer. Overall, the Frost King ACF19 FOAM COIL CLEANER is well worth every penny for how well and quickly it works! I would highly recommend this to others. Thank you!!My window AC unit is about 2 years old and had never been cleaned with a product such as this; I just cleaned the filter every week or so. I recently noticed the carpet was soaked right in front of the AC unit as were some boxes I had sitting a few feet away. So I panicked, did some research and learned what I needed to do to fix this. A few weeks prior to this, this AC unit had frozen coils and was turned off for the day and I think this caused the level to tilt forward which therefore clogged up the drainage. The outside exterior of the ac unit was pretty much dark green and super dirty, too. A friend who owns an AC company told me to order this stuff so I did and I sprayed every inch of this AC unit inside and out! I let it sit for about 20 minutes (sprayed some more since I missed some spots) before turning it back on. It was super easy to use and it sprayed directly where I pointed it, similar to shaving cream. The lid doubled as a bristle brush which helped me push some of the foam inside and in between the coils. NOTE: My AC unit is small, a 6000 BTU Toshiba. I definitely oversprayed the unit, LOL, so I only have about a quarter of the bottle remaining. Had I known how well this works, I definitely could've made it last longer. Overall, the Frost King ACF19 FOAM COIL CLEANER is well worth every penny for how well and quickly it works! I would highly recommend this to others. Thank you!!

Frost King ACF19 Foam Coil Cleaner has been absolutely essential for maintaining our air conditioning system efficiency and has restored cooling performance that was noticeably declining due to dirty coils! As a homeowner who prefers DIY maintenance when possible but needs products that deliver professional-level results, this foam cleaner provides exactly the cleaning power needed to keep HVAC systems running optimally. The foam application system is incredibly effective at penetrating and lifting the stubborn dirt, debris, and buildup that accumulates on evaporator and condenser coils over time. Unlike liquid cleaners that run off quickly, this foam clings to surfaces long enough to break down contaminants thoroughly, ensuring complete cleaning rather than surface-level results. What impressed me most is the dramatic improvement in cooling efficiency after using this cleaner on coils that had become visibly dirty despite regular filter changes. The air conditioning system now cools faster, runs shorter cycles, and maintains consistent temperatures throughout the house, proving that proper coil maintenance directly impacts system performance. The 19-ounce size provides excellent coverage for complete residential HVAC system cleaning with enough product remaining for future maintenance cycles. The quantity is perfectly proportioned for homeowner use - sufficient for thorough cleaning without waste while being cost-effective compared to professional service calls. The ease of application makes this accessible for DIY maintenance without requiring professional equipment or extensive technical knowledge. The foam sprays evenly and consistently, making it simple to achieve complete coil coverage without missing areas that could compromise cleaning effectiveness. The cleaning action is powerful yet safe for coil materials, effectively removing buildup without causing corrosion or damage to delicate aluminum fins or copper tubing. The formulation appears specifically designed for HVAC applications rather than being a generic degreaser that might harm sensitive components. The rinse characteristics work perfectly with standard garden hose pressure, washing away completely without leaving residue that could attract new dirt or interfere with heat transfer efficiency. The clean rinse eliminates concerns about cleaner buildup affecting system performance or air quality. The odor control benefits have been noticeable in eliminating musty or stale smells that can develop when dirty coils harbor bacteria or mold growth. The fresh, clean scent after treatment indicates thorough cleaning that addresses both performance and air quality concerns. The preventive maintenance value is substantial for extending HVAC system life and maintaining energy efficiency that reduces utility costs. Regular coil cleaning with this product helps prevent expensive system repairs and maintains peak performance that justifies the minimal investment in maintenance supplies. The professional results at DIY pricing make this an outstanding value compared to service calls or professional cleaning costs. The effectiveness rivals what HVAC technicians achieve while being accessible for regular homeowner maintenance schedules. For homeowners committed to proper HVAC maintenance who want professional-quality cleaning results without service call expenses, this foam coil cleaner delivers exactly the cleaning power and ease of use needed to maintain system efficiency and extend equipment life through proper preventive care.

You'll wish you bought 2 or more cans. It's plenty in one can, but it takes a lot of this stuff to clean two window A/C units front and back. I managed to do both with one can, but I'll be reordering another can to use on a stubborn unit that was so dirty it needed another dose. This Frost King coil cleaner powerfully foams into the smallest areas leaving a clean, citrus scent, and you don't even have to wash it off the condenser coils or any part of the machine in which water passes over it. You can foam other areas of the AC unit too, but spray them off with a water hose or water bottle and let all the dirt from the condenser fins and coils roll out of that exterior drain hole. You'll be amazed at the buildup that flows out (dirty water, bits of debris like twigs and leaves). I love this stuff, and it keeps both of my window units blowing fresher, colder air than the day they arrived. Now my house air is cleaner, colder, and a lot healthier to breathe in. This coil cleaner is not just a convenience item for me - it's a necessity for where I live.

Purchased a couple of these as I maintain my own HVAC. I used the first can on the coils of my Air Con, as per the instructions on the can. Frankly, before using this product and just using a high pressure garden nozzle, the outcome was about the same. I don't see an advantage for using this product. I still have the second can even though I've cleaned the coils a few more times with plain water since the purchase. I might only use it the next time just to consume the product, but not likely I will buy again. Nothing wrong with the product, just not that useful for me.

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It smells good and is super easy to use but doesn't really clean the coil much. Do not waste your money on this product people. Get your coils pressure washed instead.

Sprayed this expanding foam on the UTV Rad and my ATV rad. Sprayed 2 times and pushed the foam deeper into the rad fins using air compressor air spray nozzle. All worked great. And I was amazed how much "hidden dirt" hides within the rad's small fin gaps. I plan to use this product 2 times per year. More usage when doing deep mud runs. smiles. I recommend to others....