My upstate NY porch floor was built with stone quarried from northern PA. The previous owner got some white paint drips on it which I would like to remove. What I've tried so far:
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mineral spirits
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Sealkrete Clean-N-Etch concrete 2-in-1 cleaner & etcher
Neither of these made ANY difference whatsoever. I even tried the Sealkrete undiluted.
The only other thing I can think of is straight muriatic acid.
Best Answer
The suggestion that you made in comments to try a wire brush may very well be a good first effort. However I would like to suggest some additional things as well.