C.M.
I see you've gotten a lot of responses already, but the best thing I've found is "Goo-Gone", which you can find in the cleaning section of just about any store. I pretreat all my laundry that have stains w/ shout, but if it looks like a grease or oil stain, I put GooGone on it first, then spray it with Shout. It seems to work on any kind of fabric and even gets out crayon, lipgloss & chapstick. Hope this helps!