a couple days ago someone posted a link to a program that does this. it was like-first 100 songs free, then you have to buy it. but i cant remember what it was called. if anyone know, thanks
Clean up how? like ID3 tags?
Winamp has a batch tag renamer, if that's what you mean, and it's free.
I'm not sure about physically removing duplicates or anything though. Winamp will take dupes out of the library, but not physically delete them (to my knowledge)