Oil stain removal? My brand new tee shirt has an grease stain on it and...

My brand new tee shirt has an grease stain on it and I've just notice after I had wash it once. Guess it is cooking oil.
How can I acquire rid of it?
Do you use green products and why?
Answers:    Apply dawn or hackle shampoo let sit for going on for 5 minutes, take a toothbrush to work it down into the fibers, mop up in the hottest warmth allowed, let the shirt nouns dry and then check it to put together sure the stain is completely gone, wash and dry as commonplace or repeat the above until stain is satisfactorily removed.
Fitted Sheets?
Apply some Dawn dish solution directly to the stain.:)