My 18C cellar has quarry tiles covered with years of muck as hard as cement. I tried years ago with everything I could think of with no success. Recently friend (big guy) had a go with a chisel and and some of the dirt actually loosened so that was encouraging. I think he succeeded because this hot weather has dried what it usually a damp floor so the muck is flakier. I don't have the strength to scrape it all by hand however. Is there such a thing as an electric chisel? I have researched but all are for demolition, too powerful. Appreciate your thoughts, thanks.