Originally Posted by
BladeRunner001
Well...it's simple chemistry. Baby oil is NOT water soluble. Badger hair (or other natural bristles) are hair. Try putting baby oil in your hair and see how easy it is to take/wash it off. My bet is you would have a heck of a time and would be hard.
Same principle applies to your brush. Water insoluble stuff (like baby oil) is meant to repel water (keeps water that's in, in and water that's out, out)...this is why it is so effective as a blade oil (keep water away). So since your brush is meant to absorb water, if baby oil gets on your brush (and it will coat it once you expose to it), it will lose the ability to absorb water and hence, affect the performance and latherability.
-Robert