There is a fab product called "Goo Gone". It really is great
i use it for so many things, and most especially--stickers. On the bottle front it says:
"Removes Grease, Stickers, Tar, Gum, Crayon, Tape."
Great product with a citrus scent.
Hugs,
MoonGypsyxxx
ETA: Well, obviously i hadn't read through ALL of the earlier posts;
because some folks have already mentioned "Goo Gone". Rightly so, because it WORKS!!!
And...it lasts a very long time. i use mine quite often, and i still have my original bottle! A little goes a long way...
It is very convenient to just grab the Goo Gone..