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I wonder how well CLR or Lime-away would work? Isn't that pretty much what is built up inside the radiator anyway? Lime, calcium and rust.


Sounds like it should work, but when I've used it on shower heads etc. it was full strength, unless it works as good diluted, I don't think you want to get enough to fill a radiator. Muriatic acid sounds good but how much to use in water is what I'd like to know.