Dear Paul:
You remove grout like you do when you grout anything else: with a masonry sponge as you proceed. The application of a good-quality grout release before grouting should help a lot.
Worse get to worst, if at the end of the job you still have some grout staining, a good professional-grade scrubbing with MB-3 followed by thorough rinsing, will finish the job for you.
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
Article ID: 815
Created On: Wed, Nov 21, 2007 at 7:33 PM
Last Updated On: Wed, Nov 21, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=815