How to clean cement-like buildup between dry cooler fins
Years of accumulated buildup can harden between dry cooler fins until it resists standard chemical cleaners, pressure washing, and manual scraping. This dense blockage stops water from passing through the coils, severely reducing cooling efficiency.
What the numbers show
Counted from the threads quoted below. How we count
- This comes up 11.5× more often in r/CleaningTips than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1scraping the buildup manually with a metal scraperDid this help you?
- 2testing multiple alkaline or acid coil cleaning productsDid this help you?
- 3replacing the coil entirelyDid this help you?
- 4Using 91% isopropyl alcoholDid this help you?
- 5Using saltDid this help you?
- 6Using hot or regular waterDid this help you?
- 7Considering vinegarDid this help you?
- 8Applying white vinegar or CLR with a plastic razor bladeDid this help you?
- 9Using a scotch brite pad carefully near the sealing surfaceDid this help you?
- 10Proceeding with assembly if the gasket can compensate for minor surface roughnessDid this help you?
- 11Clean the vacuum filter more frequentlyDid this help you?
- 12Flushing the coolant system multiple times with radiator cleaner products like Liqui MolyDid this help you?
- 13Using acid-based chemical flushes like Ford VC-9 or alternative cleaners like BG cooling system cleanerDid this help you?
- 14Replacing the heater core entirelyDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Dry Cooler cleaning today. I tried three different products but the gunk that's on there is basically cement at this point. I can barely scrape it off with a metal scraper and water doesnt even pass through the fins even with a pressure washer.”source ↗
“I've tried both. As i've said i tried three different products. This stuff is really like cement.”source ↗
“Like i said, the cement got all the way between the fins. Even if i could scrape all of it off there would still be cement between the fins.”source ↗
“winter last year I noticed I didn’t have heat in my car, I narrowed it down to the heater core. I swapped it (that sucked) and found it was clogged with scaling.”source ↗
“Since then I have tried flushing my coolant with the Liqui Moly radiator cleaner 3 times and I get heat for about 15 minutes on my drive home from the shop then nothing.”source ↗
“I cannot get this garbage that was behind the water pump off.”source ↗
“I’ve tried brake cleaner, dawn and elbow grease but it won’t really budge.”source ↗
“I was trying to avoid anything too strong so I don’t grenade my cooling system. It definitely breaks it up a little bit but I know at least the heater core is still pretty clogged”source ↗
“It’s a thin layer of sticky residue. It’s really hard to get that off without being able to wipe it. I deal with the same thing in mine.”source ↗
“There is some residue in my bong I can’t seem to get rid of, and I’d love to know what it is. I’ve tried 91% iso, hot and regular water, I used salt as per usual.”source ↗
Where this came up
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