Don't Want That Yellow Look!!

I have a 1965 Dodge Dart GT with the Pearl White. Changed it out a few years back and it was not a pure white then. Over the years it just seems to be a bit duller than when new. A slight bit of yellow has shown up and would like to freshen it up. Just thought I would ask what others have or use to clean their white upholstery with.

I am not sure the yellow can be cleaned off. Usually, yellowing is a change to the actual color pigment and if permanent. Bleach possibly?