We're closing on a small house soon that the current owner built. He smeared thick compound in swirls over nearly all the sheetrock and embedded fake brick face into the lather. If there's a way to scrape off the 1/2" of crud off the surfaces I'll do the work rather than replacing all the sheetrock with new. I haven't been able to experiment with various tools since we don't own the house yet. Any thoughts? Thanks very much.