http://todd.dailey.info/archives/2005/09/27/restore-your-ipod-nano-to-new-condit ion-with-a-4-can-of-brasso/
There's a link about the Brasso. Step by step tutorial on how to not ruin your ipod with Brasso haha. It can ruin it, you just have to be careful. I've used it before and it worked fine. Here's just a few tips to follow so you don't ruin your ipod since it can easily ruin it.
-Test it in a small corner first.
-Take your time.
-Don't push down too hard.
-A little goes a long way.
-Careful around the clickwheel
I recommend a microfiber cloth because it is smoother than a paper towel.When I used brasso on mine I rubbed it in for about 15-20 mins and a few times in that timeframe I would stop a couple times for 20 seconds and let the brasso dry/sink in and apply a little more and continue rubbing. It worked fine for me so I hope it works fine for you. And lastly all you do is just wipe it off with a clean area of the cloth you're using.
On bad thing I did have was I didn't want to waste the little microfiber cloth I had (all I had was a small 2x2 inch square of it) I used a reg. paper towel for the back. It sure cleaned off all the grime on the back but it left behind tiny tiny tiny swirling scratches on the back. It's not a big deal to me but it might be to other people so I'd use microfiber the whole way around. Hope this helps..
Brasso works fine. Everyone who says it ruined their ipod is because they did it WRONG and didn't read the tutorial or get tips on how to do it. I have a black ipod, i'd be careful on using it on a white ipod because I heard it turns it a yellow-ish color, but then I've heard people say it didn't on their white ipod. I guess it's just whoever did it correctly.
I'd say go for it.