Your Wii has been melted from within. Nothing can save you.
Try the cleaning kit. The lens gets too dirty to handle the dual-layered discs. You'll be amazed at how much nasty junk comes out of that thing when you clean it the first time. It's a disc with a handle on it. You squirt a few drops of cleaner on it, put it in the Wii, and the Wii pulls it in. But the handle sticks out, so you move it side to side a few times, and then press eject. It will be dirty as hell, and your Wii will work as good as new.