Hi Jerry, Shout it from the rooftops!!! There is an amazing cleaner that is absolutely awesome for slot cards. It is called "Goo Gone". It is citrus based and actually smells like oranges! It cleans beautifully - fast and easy. I have transformed horrible looking cards into nice cards within seconds. Nothing else is even close. Use nothing but Goo Gone. It can take a tape residue stain and remove it without effort in less than 3 seconds! No harm comes to the card! The only thing to watch is the signature strip. If you try to remove a signature, it will take off the whole sig strip. Other than that, this stuff is incredible. I have even removed nasty ink stains, although sometimes, it takes more effort than others. I have to give credit to James Campiglia for turning me on to this slot card cleaning miracle.