You don't really. Once paint has dried on fabric it's pretty much never going to be the same again. The time to rid paint from clothes is immediately after it happens. For oil based paints use a thinner (mineral spirits) and for latex use warm water.(And Landmanhall said it best: paint clothes)
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Be carefull with thinner as it may ruin the garment even if it gets the paint out. Trust me. I have a set of "paint clothes" just for this reason.
hair spay, paint thiner...