I used Halfords interior spray which seems to have magically restored colour to greyed out parts of my interior.

Including the ashtray

(which had faded from black to green) and the whiteish door handles which went back to shiny black!

This was about a month ago and it still seems to be going strong, altho occasional reapplications cant hurt!

You could try some back to black or whatever its called, the stuff your supposed to use on exterior bumpers.

Its a strong as anything but might stain stuff if you over apply it!
