Grout Applicator Pic Please Help! Having Trouble Removing Grout Sealer That Dried On The Surface Of The Glaze Tiles. Suggestions?

Please help! having trouble removing grout sealer that dried on the surface of the glaze tiles. Suggestions? - grout applicator pic

You are not using drip applicator grout sealer and on the tables of the application. Of course not immediately cleaned and dried. Now the surface of the tiles are all scratched. I do not know what to use. All ideas on how to remove stretch marks?