Paint can be a force to be reckoned with. It finds its way to surfaces it isn't wanted upon and dares anyone to try to remove it. The type of paint will determine the amount of effort involved in removing it. Regular soap and water won't do much to relieve a metal door of this stubborn substance. With a little time, patience, and elbow grease, however, paint can easily be removed from metal doors leaving the surface as though there was never paint there at all.
Apply paint thinner to the painted area with a paint brush. Pressure wash the area on a setting of 80 psi. Make sweeping motions with the nozzle and stop periodically to check the progress. This works particularly well on spray paint.
Use a heat gun to heat up the paint until it begins to curl and scrape it away with a scraper.
Apply paint thinner or stripper and with a paint brush and scrub it away with a wire brush or sand paper.
Use nail polish remover with acetone and a soft bristled brush and scrub away the unwanted paint. Rinse the area with water or hose it down if it's outside.