I'm having a matte glass tile backsplash put in my kitchen. We put up some tiles just to see how it would look around the perimeter to get used to the color (no glue or adhesive yet). The tiles around the stove got some grease on them. I tried to clean them but nothing came off. I called the tile store and they said they need to be sealed with 511 Impregnator by Miracle. Three coats and it's supposed to dry clear. My tile person says glass tile won't accept sealer and the grease should just come off with hot soapy water. I'm not sure what to do. Thanks for your thoughts.