Superdrive issues

[Scorch07]

I made a post a week or two ago about my superdrive being a little weird. Well now it's being pretty much non-functional. Just about every disc I put in there now won't read. It seeks around for a minute then spits it out. It's not totally helpless, I did just find a CD I burned on it that it will read, but a lot of music CDs won't. Anyway, my question is if this could just be dust building up inside of it. I tried squirting a little compressed air into it earlier, and it sort of seemed to work for a few minutes, but now it's back to doing it again and air no longer works. Any suggestions? I have a cleaner DVD on it's way, which I needed anyway, but I still thought I'd check around for ideas.