Dear Sue:
“
The granite was sealed about 2 yrs ago and the stain seems on top
”
Trust me: the “granite” was not sealed two years ago. To make certain, I'm sure that they applied a totally useless (under the circumstances) impregnator to it, but that doesn't mean that they sealed your stone: black “granite” can't be technically sealed due to its inherent high density.
That duly said for information sake, to remove the hard-water rings that you have around your faucets, scrape the worst off with a razor blade (no, it will not scratch your stone) and then finish the job with MB-3.
No comment about your water and dish-soap concoction.
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: 972
Created On: Mon, Dec 31, 2007 at 3:50 AM
Last Updated On: Mon, Dec 31, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=972