I've noticed a small puddle of light oil beneath the rear wheel of our Rohloff-equipped tandem. I'm told that a small amount of leakage is normal and I'm not worried about that.
The issue is that a lot of it falls on the rim and the tire. Obviously it's bad news on the rim for braking, so I'll be wiping it off and possibly cleaning with diluted degreaser.
My question is: is exposure to light oil likely to damage the tire? I know some rubbers can be sensitive to certain chemicals, so is hub oil/bike tires (in this case Schwalbe Marathons) such a combination? I would've thought someone else would have had this problem if so, but I'd like to check.
More generally, are there any products/chemicals should I keep away from tires for fear of degrading the rubber?