R.Y.
My mom used Goop to get out grease and food stains on laundry for years! It works great on most things though I wouldn't use on delicates like silk or dry clean items. You can find it in a hardware store. I usually use the oxyclean stain spray which gets out a lot of food stains (I think it is a little better than Spray and Wash). The trick with the dish detergent is good for grease too.