[Rollavia]

This has been depending upon the paint that you're  removing as well as the sort of plastic.  Resin bodies and injection molds are resistant enough to use odorless thinner. But a lexan thermoform requires further delicacy. To begin      with, use shavings from some bar soap and cover the hull with the soft soap. Wait a few hours as the paint softens. Then rinse away. A label-removing fluid also softens most enamels. Though resin casting with a coat of nitro-cellulose has a higher resistance.  Use a dozen cotton swabs to get to the seam lines.