Things You Will Need
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Vigorously rub the stained area, using generous amounts of the thinner. (This will only be effective if the primer is fresh and has not dried.)
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For dried areas, you will need to use a harsher chemical. Spray the stained area with "Gumout Choke and Carb Cleaner," and rub with a clean rag.
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Vigerous rubbing and repeated applications will be required to remove the primer completely.
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Repeat steps 3 and 4 until the area is clean.