Nope clean it up to the point where it won't rust (but leave the pattina alone) put it some where completely dry, and only handle it while wearing rubber glove's!
I'd be too afraid I'd lose a rare or otherwise "special" SAK... not that I lose a lot of stuff, but I'd always be thinking "Is it there?" "is it still there?" *taps pocket*
The antique store dealer said that my champion was made in the mid 70s. I myself, am not a 100% sure.