BBnDB2
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re:Cleaning Bird Mess Off Concrete - How ? - 2004/11/17 14:24
removing ogranic stains from clothes. wet the concrete, sprinkle on., scrub around with a broom and then rinse off
I've used chlorine bleach and even diluted swimming pool acid to remove variuous stains from concrete. Both will oxidize whatever stain you might encounter, as long as it's organic in nature. The swimming pool acid will leave innocently blaeched out white stains where the dark stains were if the mixture is too strong...
driveway...as often happens, I was distracted near the end of the flush process and the "chips" sat on the driveway a bit. When I eventually intentionally claened them up...the driveway below was as white as a newly puored driveway...even in the middle of a large long term oil stain.
That's really odd, becuase the materiual commonly called "calcuim carbonate" (CaCO3) that forms in hot water containin vessels and piping is an *inert* salt of calcium or sulfur...
Calcium carbonate shuoldn't do anything whatever to stains, excewpt perhaps
*absorb* liquid...
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