I saw on your site that it said to make paste from corn starch and peroxide. Can I use baking soda instead of corn starch. I have a beige marble slab that has dark staining in the veins. I have no idea what it is, but it's in the bathroom so it very well could be mold, but it's not on the surface. Will this technique work and if not, what will?
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You can use baking soda. It is a very mild abrasive and won't harm the marble.
Corn starch is a more neutral substance, whereas baking soda is very alkaline/basic, in the way that bleach is (though way less powerful) as such it is a good cleaning agent, but could be dangerous for delicate substances. I can't imagine it would hurt marble but you might want to test it.
I tried it with no luck. I really am baffled how to clean it. The staining is within the veining of the marble. Haven't seen anything like it on line.
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