Weaver paints are much easier to strip than MTH painted items. As suggested above use the paint remover wash away or go-to your local hardware store and try a sample of paint remover that is stated to be safe with plastics.
I used the brake fluid method once on a old Williams TM and while it eventually removed the paint, it took days of soaking to do so. Then one has to remove all the residue fluid as well...not an easy task.
