Oil Stain?

Stains are a pain, messing up that brand new shirt, pants or dress that you just bought. What my sister actually discovered that works to some degree to help get rid of (lets say) 60 percent the oil stain is actually dish washing detergent. Just sprites some of detergent onto the stain, let it sit for at least 20 minutes and then rinse it out. Process may need to be repeated and should be done as soon as possible when the stain is fresh to get the best result.