I am wondering what suggestions there may be for cleaning the residue build up off the sandpaper from the drum sander. I have been using Mineral Spirits/Paint thinner. I spray in on, let it soak in for 4 to 5 minutes, then using a utility knife I am able to pick the strips of build up off. On occasion there will be some that requires soaking 3 and 4 times before it all can be removed.

Any suggestions? What do you use? What are your methods for cleaning them?

Thanks.