After much searching I've found a nice, easy-to-follow guide on how to restore clear plastic: http://www.oldmodelkits.com/blog/pla...ic-model-kits/

The Novus Plastic Polish can be bought relatively cheaply on ebay from this chap: http://cgi.ebay.com.au/Novus-Plastic...item255e2ff718

I've since bought a kit (great to see it comes with a polishing cream as well as the scratch remover!) and will be giving it a whirl on some parts when it arrives. Will update the thread in due course.