Something has been bugging me about my S3's headlights since I got it, and that is the cloudiness of the headlights. I tried some plastic window cleaner with a dremel, but that didn't seem to shift it at all.
I read today about kits you can get to clean them up, and googled a few threads about using wet and dry etc.
Had a look in my shed, found some 2000 grit, and with a bit of nervousness started to rub.
I only spent about 10 mins on each headlight, and then followed it up with some Brasso.
Its not perfect, but much improved I think.
Obligatory before and after pics;
S3 Headlight Cloudiness by iaintookey, on Flickr
S3 Headlight Post Clean by iaintookey, on Flickr
I might give it another go with some finer grit, but they look much better than before anyway.