Firstly I want to give a huge thanks to Ernie (nerdman) who set me on the right track. I was originally investigating tumblers when he put me on buffing wheels with greaseless compound. Ernie even found a retailer in Australia that stocked all the stuff I needed.
So I ended up with this set up.
So, onto the two blades I wanted to clean up, a Puma and a Joseph Elliot. They've both been in my repair box for a while but I didn't have any idea how to fix them up.
Here they are. As you'll see, not too flash. Not too inviting to use.
So I ran both of them through the black emery and polishing compound and this is how they came up.
The Joseph Elliot
They certainly look a bit better than they did.