Fossilized Masking Tape Removed Cleaned from Typewriter Body by [[Phoenix Typewriter]]
The paint on the metal of the SMC 6 series typewriters will generally stand up well to lacquer thinner and along with scratching can be used to remove the old residual masking tape often found on these typewriters.
WD-40, gun bore cleaner, and Simple Green generally don't do much to this sort of tape residue.