Join Date: Feb 2010
Location: Narragansett Bay
Thanked 357 Times in 336 Posts
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We used to use diluted vinegar to clean corrosion off diving regulator parts. Leave it soaking too long and metal began to disappear. It's surprising.
Be careful with slow descaling methods. If your cooling system is heavily scaled, you run the risk of chunks of scale coming off and blocking passageways, which then makes it very hard to get acids to them to dissolve it away.
I am told there are commercial products that work like miracles, but I don't have personal experience to recommend one. I'm only thinking that I would want the scale to be obliterated on the first dose. If you flush frequently, this wouldn't be a concern.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.