Hello! I live in a 1930s Sears bungalow, and I'm researching how to remodel the original bathroom. The tub is still in good shape, and can be salvaged with reglazing, and the plaster walls are still in great shape, but the original tile on the floors, tub surround and lower walls was tiled over at some point. (The original tile is still under there.) I don't think I can salvage the old tile, but I'd like to get the bathroom back to the 1930s style. How can I remove the two layers of tile without destroying the upper-wall's plaster? Can I just cut the wall along the tile line? And what would I use as a base layer for new tile work? Any suggestions would be so appreciated! Thanks!