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Q: Is there paint, etc. that will make objects look like white marble?
A: numerous art classes/painting classes can teach you faux painting techniques . amongst them how to make something look like white marble - google faux paint
Q: How to clean marble sculptures?
A: Although the firstly answering looks good and your firstly endeavors rather dangerous , I would propose circumspection as harmetres away from fire can include greasy soot and fumes that are able infiltrate whilst some cleaners can damage marble . If the statue has any values you are able want to contact a conservator .
Q: How do i get my marble sculpture clean?
A: You is perhaps not able to , because marble is permeable and the stains is also possible chemically bounded . Especially because you have already attempts bleaching . I would propose contacting a neighbouring art museum that has marble sculpture holdings and see they will give you some free guidance on marble refurbishment and conservation