cleaning solution for cab roofs

hi guys
any idea's on whats the best solution to use on cabrio roof to get them clean an back to black mine started to go a grey colour.

not sure but the autoglym kit works a treat wether it makes it black again..... im not sre

thanks for that i'l give it a shot

i used autoglym vinyl care, it came up a treat

Rizzo said

i used autoglym vinyl care, it came up a treat

So did mine   But when CHN fitted it (vinyl) in December he said white spirit is as good as anything to use, will stick with the Autoglym tho'