I am in the process of replacing the floor in the shower stall. I have removed all the floor tile and now need to remove the last row of the wall tile, without damaging the tile. I have a grout scraper, chisel and hammer, but the grout is like a solid block of cement. Is there anything I can do to help speed up the removal process? Oh and I am broke, (a teacher's life) so it has to be done with what is in the house.