So, as a kid I used to have Frogger 2. It was one of my favorite 2600 games. At one point I think I accidentally knocked it onto the floor and stepped on it in middle school. A few weeks ago I wanted to get another copy and was discouraged by how high it was priced on ebay. I ended up finding a copy that had a really crappy label for a lot cheaper than the other offerings. It had what looked like coffee stains, tears, and a name written on it in black sharpie. Sorry about the poor image quality, it is from the original auction photo.
I restored it using a rubbing alcohol wipe to remove the name (don't try this on a regular printed label it will remove the ink from that... I used it on the metallic part)
a silver sharpie to make all other corrections.
I then cleaned it up nicely...
check out the restored version.