I laid a tile floor in my bathroom and used too much mortar, which pushed up between the tiles. There wasn't enough room for grout in some places, and now it looks messy and is difficult to keep clean. Is there a way to remove some of the excess between the tiles? I had though maybe I could soak it section by section with vinegar and then use a tool to dig some out. Another option I can think of would be to do the same without the vinegar. Does anyone have suggestions? I'd rather not have to remove the whole thing and start over. Thanks!