C.M.
In a nonaluminum large container, kitchen or laundry sink, put 1 cup powdered dishwasher detergent, 1/4 cup household liquid chlorine bleach and 1 gallon hot water, and mix well until the powder is dissolved. Test for colorfastness of the item on an area that won't show. Place the garments in the solution and soak for five to 10 minutes. If the stains are still there, soak for up to 20 minutes more -- any longer (like overnight) will not work any better! Rinse and launder following the care instructions. That is all there is to it!
This is from Hints from Heloise, it is what our family has been using as long as my mom can remember.