Interior color change dash question

well i baught pretty much everything to do the swap. I was just going to paint the two parts on the edges of my dash that are grey to black. But when i started washing them to get them really clean for paint the grey started to come off. Its a black plastic with factory grey paint. Has anyone used any sort of thiner to get the grey paint off, it will look much better than painting. I hope someone has done this before or has an answer. I appriciate any advice. :nice:
 
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