Dear Bjablonski:
Never – I stress NEVER – use any acidic cleaner on natural stone, if not on exceptional occasion. And this is not exceptional at all!
Remove the worst with a razor blade, and then finish the job with a good-quality heavy-duty alkaline cleaner with chelates in its formula rated for natural stone, like MB-3.
Once that is done, instead of applying a regular impregnating sealer, you may want to consider the possibility of apply a stone color enhancer instead, like MB-6. Not only will it seal your stone, but it will also produce a permanent “wet-look” (the color enhancement only, not any sheen). Wet I few of your tiles to see how you like them.
Just a suggestion…
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,
Maurizio Bertoli
www.marblecleaning.org – The
Only Consumers' Portal to the Stone Industry Establishment!
Article ID: 799
Created On: Sun, Nov 18, 2007 at 4:34 PM
Last Updated On: Sun, Nov 18, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=799