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I have a cement floor of in a garage nearly 100 years old. Suddenly I'm seeing puddles of a liquid substance, that looks like water, but doesn't act like it. When I put sand in it, the sand turns to mud, then a few days later, a black spot forms. The liquid takes several days to evaporate and...

I have a mysterious liquid that keeps appearing on the floor of my garage. It looks clear and doesn't smell. Yet, it doesn't dry. It also increases in volume. I put some sand on it thinking it might have been oil (although I do not keep my car inside). Hours later the sand turned into mud...