Originally Posted by Jklingel
Am I missing something here, like neurons?
If you use either, especially in your garage, you will be missing neurons. Both are pretty nasty solvents (physiologically speaking.) Both would also be quite effective for wiping down tubes (depending on the soiling you want to take off, of course. They'll work well on oils and greases and such, not so well on water soluble stuff.)
Both MEK and Toluene will dissolve or soften the hypalon (which is why you'll find both in various hypalon adhesives - promotes good penetration.) They are both reasonably slow, though, needing an amount of time to soften the material to a noticeable degree. A quick wipe with a rag followed by time for evaporation should not bother the tubes at all. The reason for using something that softens the hypalon is to get stuff out of the pores of the material.
I would agree, however that Simple Green (or other non-solvent cleaner) would be a better first choice; solvent should be a last choice.