I don't know about bio-diesel but WD40, mineral spirits, gasoline, Varsol and other similar or harsher solvents should be avoided. Here and there isn't the end of the world but regular use of such solvents to wash your skin will allow some of the solvent to leach through your skin and into your blood stream and on to lodge in your internal organs and do accumulative damage. You won't notice it for the first few years but at some point late in life it may lead to other things.

Borax or GoJo with pumice in it will remove greases and paints as well or better than the solvents that you SHOULD be avoiding contact with on a regular basis.

For years I was a big believer in barrier creams and used them frequently. These days I'm a big believer in dispoable nitrile gloves.