this pokemon blue cartridge got wet in a wash machine several years ago. I never again got a sprite image out of it every time I tried it on my gameboy. last year I cleaned the contact but couldn't get it working. then I discover interestingly enough that if I apply the cleaner and put the cartridge inmediatly on the gameboy it worked and could play for about 5 minutes until it crashed. I think it crashed because the cleaner dried in those minutes. I use the same method and it works every time but then again.. until the cleaner dried. It's strange but I'm sure I can fix it. those sections in red is where I use contact cleaner. you can see that those parts have something like white oxid that I can't get rid of. every time the cleaner dried up they come back. (that's why the game crashes after a couple of minutes I suppose) as part of the cleaning process I got this funny glitchy sprite once LOL I hope you understood my poor english and have some ideas to clean the white oxid or whatever it's called. Thank you!