My view finder is scratched

Hi,

It looks like it can be, though it is not an easy fix.

Here is a place that sales the part for a good price:

http://www.dslrparts.com/nikon-d70-camer...

Here is the iFixit.com Guide that can help you replace this part if you are planning a DIY repair:

Nikon D70 Eyepiece Replacement

Try something that polishes plastic. There are products that clean and conceal scratches on plastic materials

Car or furniture wax might work too.

Won't get rid of the scratch but maybe get hide enough that you won't notice or be bothered.

Good luck!