Well its always nicer when its clean...but i buy everything as long as it goes in my price settings.
Every time i get a NES game i already have, which is my primary goal to get get them all, i analyse for a good 2 minutes all aspects of the cart and keep the best one.
I got 274 dups for nes so ask me if you want to trade!!
Clean is the best Eraser for Marker
Lighter Fluid for sticker when not on a unprotected label.
Thats it