Cleaning marble/granite head stones

Anyone done it if so any tips for the resident idiot?

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None of those search links go into detail how to clean marble headstones. The one post shows a 6% SH and brush scrub on granite but others have noted marble and strong SH don’t mix.

I’d like to know myself.

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I think @Racer posted a .Gov restoration standards link at one time, think it had something on stone

Edit, check this Limestone Restoration on a Stadium - #14 by marinegrunt

Search marble and granite. There is quite a bit of info around of how to clean them

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