Not the ones I had...the green 6 x 9 pads about 1/4 inch thick. I think I last saw them in the paint/chemicals section of the hardware store. I cut them into about 6 pieces, about 3x3. Put a little denatured alcohol on the surface, scrub the finish, wipe the gunk away with paper towels or rags. Repeat until wood is clean, and I usually do a final wipe down with a rag soaked in the denatured alcohol to clean any residual old finish. The pad will eventually gunk up, but it doesn't melt or shred.
This is an example from a little doll bed headboard I picked up today at a junk sale. Looks like the shellac was colored. Going to be a refinish for my little niece.
[ATTACH=CONFIG]299264[/ATTACH]