Armor all contains alcohol, which dries the plastic over time. Looks great (to some) when applied perhaps, but long term it will dry out the vinyls and plastics.
Hopefully 1slosix's recommendation of a plastic type polish will work for you. Try a motorcycle shop for some tough plastic lens cleaner, as older bikes had a tendency to have their gauges fog up, much like the auto's headlight lenses do today. Perhaps those kits that remove the fogged plastic surface will work, but I'd start with something that's less aggressive first.
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.