If you look at the tank near the pivot you might be able to make out some marks that appeared when I put this razor away wet and forgot about it for ages, now I want to start using it again I think I should try cleaning it up before honing it back to a shave ready state.

I think it may be rust or it could be soap residue... I'm not sure!

Can anyone recommend a cheap DIY method of cleaning the tang please, I have a good dremel with some buffing wheels but I don't have anything specific to clean the marks off?