Solvents and lubricants are full of nasties that get absorbed through your skin. I hardly do any work on the bici or moto any more, without nitrile gloves.
I need to stop cleaning my greasy hands with WD-40. But it works so well and I love the smell of it. However, cancer or whatever else I might get from doing this is not worth it. I am gonna get some nitrile gloves.