Was asked years ago on this board and got many replies....if I remember correctly some of the responses were a pencil eraser, a Q tip and some liquid (don't recall what liquid) nothing was said just another thread. I still have a $5 River City New Orleans chip I was sucker enough to buy at the first Blast From the Past show in Biloxi and didn't notice the cancellation was removed until I got home.....Times sure have changed.