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I had some old firework char marks that were on our back walkway for years. I got a high preassure hose (plugs into water line and electricity for the pump) and fired away.
Not only did it get rid of the char marks, I discovered the concrete used to be a whole different color... a really light grey rather than dark. Good luck.
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- Artsemis
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There are two keys to being the best:
1.) Never tell everything you know
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