For starters, I know how to finish drywall. That's not what this is about. I don't mean to be snotty, I just don't want someone to waste their time going through the basics. I have been assigned to repair 2 huge rooms that have had hundreds of screws and nails in the drywall. It started out as four of us doing it. It turns out the other three don't know shit about drywall so they were pulled off and I was left to clean up the mess. This isn't my regular job, I'm contracting here so they can pretty much ask me to do anything they want. So anyway, The dudes working in the other room must have thought that they were getting paid by the pound of mud they slinged. Their repairs are way, way thick with joint compound. Now, I get to finish their mess. Here's a picture of what I'm working with. As I said, this is a huge area. I know I am going to have to sand it all down. My question. Is there a good way to remove that much dried mud besides just sanding? I have sanding sponges and a sanding block with sandpaper. You'll notice that the wall is finished so I don't have to worry about damaging the paper. Would a screen take more joint compound off? Anything else I could use? Note, this doofus found some oil based spackling and that's what this shit is. I don't think I can use a wet sand because of that. Any suggestions would be appreciated and some will even be answered with sarcasm.