We had a large dog about 25 years ago that we used to let sleep in cellar at
night. She was very thoughtful; when she got sick at night, from eating god
knows what, she threw up, not on her nice rug, but on the cement floor.
That was 25 years ago and the stains and efflorescence are still there. We
have never been able to clean them off.
Would anyone know of a way to remove that kind of "stain"? Apparently, the
strong acid in the stuff worked them into the cement. We'd like to avoid
<< Apparently, the strong acid in the stuff worked them into the cement. >>
Stomach contents may contain a small amount of acid, like HCl. So yes, that can
attack concrete. Try treating a small area with dilute HCl (muriatic acid). If
that doesn't work, switch to something highly alkaline, like TSP. For more
choices consider looking at products offered in janitor supply outlets. The
pros often have unusual items not commonly found at the box stores.
<< We'd like to avoid painting. >>
Why? That may by far your best option if nothing else works. By the time you
give up the struggle with the stain the area should be quite paint receptive.
Whatever, good luck.
Rent or buy a jack hammer and break up the floor. Figure out how many
cubic yards of concrete you need, and place your order. When the
concrete arrives, they will pour it in thru the basement windows.
Finish as you would any concrete. If you dont know how, hire a cement
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