STAIN transformed TAPE to CONCRETE
I find WD-40 usually removes that cursed masking tape residue - combined with lots and lots of patience!
May I respectfully suggest that next time you use the green painters tape. It's more expensive but peels off easily, even after a good length of time, and it avoids spending a lifetime trying to remove gunk left by the out-dated traditional brown masking tape.
I agree w/Alan. There is a big difference between masking tape and painter's tape. The latter doesn't leave any residue behind. Even stuff like Skin So Soft should work. Try WD-40 first if you'd like. If you can't find the Painter's Tape, ask for help in the store.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!