get a cheapie paintbrush, and brush a layer of brake fluid over the panel. lay it flat, and let it sit for a while. you can use a scrub brush or a pressure washer, on low power, and the paint will come off, in a sheet. stubborn spots, just reapply. you'll notice the paint start to wrinkle, before it starts lifting off the plastic. brake fluid wont eat up plastic. we use if for stripping factory paint off model cars, planes and trains by soaking them in a jar or tray with fluid. use it sparingly, as in reality, you're washing it into the ground or drain, depending on where you do the stripping at. some grease cutting dish detergent when you're done, will remove any traces of the fluid, in preparation for painting.