Just to let you all know, I just refurbished my air vents and heater control dials, taking off all the sticky stuff, I have chosen to repaint mine in black vinyl paint, looks relatively age authentic, but I guess you could use any paint suitable for plastics. I use my soda blasting cabinet, quick, gentle and effective.
If you're in Scotland send me a pm and bring your car to my workshop and I'll pop them in for you!
If you're in Scotland send me a pm and bring your car to my workshop and I'll pop them in for you!