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cleaning unknown stuff from a slate floor

Postby maxowles » Sun Jun 14, 2009 8:59 pm

I am about to move into a house with a slate floor, and want to seal it to make a feature of it, but there is something on some of the slate, and chemicals don't seem to touch it, is it possible to sand/grind with an ordinary angle grinder (dry) without ruining the slate and if so what discs should I use.
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