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Concrete removal

I had some new sidewalks poured a couple of weeks ago. When they poured the cement they splashed it on the exterior walls and I'm not able to get it off. I have tried vinegar and even a power washer. Both of those did not get any of it off. What can I use to get it off so I can paint over the top.

Re: Concrete removal

Muriatic acid.............

Just be sure to read and follow the directions and warnings to the letter 'cause it'll eat a hole in most anything including you.

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