I'm having major drama/frustration with my granite counter tops! I have so many water marks and mystery spots that won't come out - so I Googled a solution: mix baking powder with hydrogen peroxide, pour it over the stain, cover it with plastic wrap dotted with holes, and leave it to dry. This "solution" turned that entire section of my counter three shades lighter than the rest of the countertop in my kitchen! Is this something I can fix? What should I do?!