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I need to clean an antique soapstone plate from India. The plate is unsealed, with a matte finish, and is 14" in diameter and covered in lacy filigree carving. It's a naturally dirty cream color (that sounds ugly, but it's actually a nice shade of stone), but it has some discolored areas that are greyish-tan. The discolored areas aren't part of the stone's natural coloration. I think they're deep oil stains from years of people's hands touching the plate.
I've washed the plate very gently with Ivory Liquid soap and water, but the discolored areas remain. I've also rubbed a very soft toothbrush over the surface, with no effect on the stains. I've read that hydrogen peroxide can be used safely to clean stains on soapstone but, before trying, I'd like to see if anyone has tried this method of cleaning.
Not worth risking a chemical (or mechanical) agent, especially if it's "porous."
Have you tried Simple Orange? It is D-limonene chemistry.
But again, are you sure you want to risk further damage?
I'm familiar with patinas on different objects ... but the "patina" on this plate is just dirt and/or oils from people's hands, and it looks dirty and unwashed.
I'm not trying for a gleaming bright finish but just want to lighten the dinginess a bit.
I haven't tried Simple Orange yet. If it contains citric acid (or any acid), I can't use it.
I have a little soapstone box I put something greasy in about 30 years ago, which left blotchy stains. Just checked; the grease has diffused a lot, so the stains aren't so noticeable.
My takeaway: the stone is very porous, and it will probably be impossible to get the stains out.
Maybe look into stuff used to clean stone counter tops; they have similar issues.
I'm familiar with patinas on different objects ... but the "patina" on this plate is just dirt and/or oils from people's hands, and it looks dirty and unwashed.
I'm not trying for a gleaming bright finish but just want to lighten the dinginess a bit.
I haven't tried Simple Orange yet. If it contains citric acid (or any acid), I can't use it.
Thanks again for the suggestion.
According to the Canadian version of the MSDS for Simple Orange, it may not be acidic, but it is still corrosive/caustic. Limonene is the key component of the oils in citrus peels. The product also contains caustic potash.
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