Hello robin123,
I've recently restored my iPod (including clickwheel) and dock to their former scratch-free and glossy condition using a product called Polywatch. For the clickwheel I placed the tiniest amount of the paste onto a cloth and rubbed it in using my fingertip so as not to leave any excess. Then, I worked gently in a circle around the wheel so nothing could get between the edge and the iPod casing.
The results are astounding. I posted some preliminary pictures here;
http://homepage.mac.com/theduffer/.Pictures/Images/Scratches.jpg
I hadn't really touched the clickwheel at that point but now the whole thing is totally gleaming - as are my iMac and eMac!
Hope this works out for you.
The Duffer