The other day, I purchased a plank from B&Q which I could get into the car only by placing it longwise in the cabin with the front edge on top of the dashboard. Stupidly, I didn't put anything underneath the wood, and consequently there are some small scratches on the plastic surface. The marks are not deep, but noticeable. Can anyone suggest something I could apply to fill the scratches and make them less visible? I don't want to sand it down as that would remove the existing surface detail. The plastic surface is grey. I'd be grateful for any advice.

