I hired a contractor to remodel a bathroom, which was added on about 10 years ago, by a well known local contractor. The bathroom was ugly as crap, and I an going for a nice, new, sleek design. They jacked out the old seat, and look at what the old contractor did. He used Sharkbite fittings, scabbed in short studs, layed drywall on the reverse wall up and down, and is a huge mess. We have gas lines, water lines, and electrical all mixed together (to supply an old tankless water heater). How do you think I can clean this up properly?