Dear B:
Acetone will seldom do anything. The “masters” of malicious doctoring have gotten so good that their “magic shoe-shine” is resistant to most solvent. It is not resistant to acids, though.
Soak it with a solution of water an phosphoric acid. That'll do it.
Needless to say, if marblecleaning.org could have its ways, situations like this one would not exist. But we can't do anything by ourselves. We need the support of the consumers to succeed. On that spirit…
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Mauri
Article ID: 1600
Created On: Sat, Aug 2, 2008 at 1:37 PM
Last Updated On: Sat, Aug 2, 2008 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=1600