I used the following method to get out some set-in stains (red jello and spaghetti sauce mashed in and dried in the dryer, other unidentifiable stains noticed after clothes were dried.)
Make a paste out of Shout gel (or your favorite stain remover or detergent) and baking soda. Scrub this on stain with a firm toothbrush until as much is gone as possible with scrubbing. Then splash on a little white vinegar and let it foam for a couple minutes. Rinse with water as hot as is safe for fabric. Pretreat again with a little more stain remover or detergent and toss into regular wash cycle immediately.
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