"Mike" wrote in message
ups.com...
You could always sand it down with a power belt sander. If you scrape
it off, chances are you are going to end up skim coating the ceiling
and sand it down anyway because it will be pretty hard not to nick the
drywall surface. The sanding option is going to create an intense
amount of dust.

I'd almost just rip the drywall off and rehang it, drywall is cheap.
But hanging ceiling drywall isn't exactly fun.

a belt sander will dig more holes faster than you can blink an eye than
scraping will.