I used BF on my black F-350 with a pc. The BF got on the textured door handles and bed rail covers, two weeks later all those plastic pieces have a tan residue on them and i can't get it off. Its been 3-4 months now and the residue is still there and has not faded a bit. I tried acetone, wd-40, soap and h20, silicone spray, and nothing will remove it. I used a toothbrush to scub also. How do i get it off?