FYI - In our local paper there is a weekly column by "The Queen of Clean", Anne Cobb. Someone wrote in asking how to keep her husband's black marble headstone clean. The "queen" said to "use 1 part liquid fabric softener to 2 quarts water. After cleaning, polish with a soft cloth. To seal and protect the marble, apply a coat of "Clean Shield Surface Treatment". Stains, grass, and dirt will wipe right off." Does anyone have an opinion on this? I've never used the product but she gave a 800 number and I've seen her advertising it on TV. Marge "Life is not a dress rehearsal. Live it before the road runs out of bricks"