Originally Posted by dougpke
As a second to last resort use muriatic acid. As a last resort, use a jackhammer..... ;-)
I bought that acid to remove stains from wet concrete on brick and I have not yet used it.
And I have a radio in the basement that I have been meaning to install in my truck since 2003.
It seems those oil stains from when I replaced a head gasket are not very noticeable so I guess now I may never do it.