gear oil is my kryptonite. burnt up 40yr old junk with the limited slip additive makes me actively gag.
i have burned more pairs of dickies and thrown away more shoes than i care to admit.
also, never, ever send it thru the wash. even pre-treated it'll make everything give a faint waft of gear oil reek. say if you do, and say some of your ol' lady's stuff winds up in there with your stuff, well, then that's on you!