We put polyurathane on our unglazed ceramic tile several years ago. It is peeling and flaking real bad now and we are looking for something to take it off of the tile but leave it in the grout lines. So far the best thing we have found has been duct tape, we put it down and then pull it up and the polyurathane comes right up with it. Only problem is, it is very time consuming and we were hoping for something stickier and maybe bigger. Any ideas?