I was working at an empty property this week that's being cleared out for renovation. There were a couple of rusty tools by the bins that the owner said I could take. I only really wanted the trowel but took the other thing because it looked useful. I thought it was a pin for securing something but didn't give it much of a look. The pin thing turned out to be a snap-on punch and has cleaned up well so I'm pleased with that. I tried wire brushing the trowel then a quick overnight in vinegar and it's coming up nicely but has some deep pitting from the rust. The metal is quite thick though and it's got a really solid handle fitting so if I can turn it into a user I'll be very happy. Out of the acid and cleaned up with the wire wheel. Then a bit of work on the sander to remove the light pitting. I'm taking it slowly so I don't heat the metal too much. The inside of the blade looks pretty bad though, nothing that would stop it being usable I guess but I'm not sure how far to take the restoration. Does anyone have any tips for dealing with this that will make a better finished result?