I just used Duralit to remove a scuff on my plastic watch face. Worked a treat in a few seconds. (The 3 rating on this tip is only because the system wouldn't let me submit withiout ticking a box - I didn't actually try it.)
The tips, hints and ideas at TipKing are vetted prior to publishing however some methods remain speculative in their own nature; therefore the information should be used responsibly and at your own discretion. The Information is displayed on an "As Is" basis, without warranty. Full disclaimer