Been using toothpaste for the last 40 years. Any of the white paste works best, not the green gels. Once did some 71 Challenger taillight lens and the things came out brighter than new. But it does take time. Also did the ones on my 69 Charger. Just keep moistening your cotton rag (old tee shirt) when it starts dragging and drying out, it will form to grooves and edges after rubbing for awhile.