The best way to protect against hair oil is to choose a suitable shampoo and hair cosmetics. But in general, it is difficult to recommend which shampoo. It is best to go to an experienced hairdresser or stylist. They are, one might say, exaggerated, something like doctors. Together, it is often not a problem to find a way and means to deal with fat. :) EDIT: Watch out for garage hairdressers and stroller stylists, or one lady was talking. :)