I'm a MT student with light blue sheets for in and out of class work. I'm using a variety of products, i.e. Hoba Oil, Biotone Gel & Face Cream, Peppermint Pandango, and etc. and after ten weeks of too much oil being used and eventually dripped on them I can't seem to get the oil stains out. Thankfully they don't smell rancid but they look dirty. I've tried pretreating with a myriad of detergents and shout, bleach, and extended washes but I still have these lovely stains. Can someone please help!

In the interm I've purchased a white fitted and a black top sheet for in-class work. They seem to hide the stains better than the calming light blue ones.