A while back, someone (I think Phil Ethier or Roger Garnett) recommended Kroil, from Kano Labs. It's a penetrating oil, "The oil that creeps, penetrates spaces as small as one millionth of an inch". Send them five bucks and they'll send you a can.
For $5 the sample, it's hard to go wrong. They'll do up to four cans of sample per mail order. It's great stuff. I'm also fond of their FLOWAY degreaser. - Chris Kantarjiev
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