If you're taking your tools to site I wouldn't worry too much about them being all nice and shiney, in fact a light coating of rust can be a good thing, because don't forget bright and shiney attracts magpies and other thieving toerags.
http://www.instructables.com/id/Electrolytic-Rust-Removal-aka-Magic/
The above link gives more detail of the electrolysis solution.
It probably takes longer to read about it than to set up and it does work.
The only critical thing is to connect the supply the right way round!
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