NO!!!!! Armor all will actually dry out the material. It will make things like dash pads and vinyl top parts shiny and spiffy looking but they will get hard and crack after a while.
The best thing I have found is the stuff used for shining and cleaning leather, vinyl, latex and rubber clothes. It cleans, conditions and shines the best. There are a billion names out there just do a search for "latex shine" or "rubber shine" in google/yahoo shopping or ebay or just goto your local sex/fetish shop. The stuff is cheap.
note....Yes I know I am a pervert! Another handy tip....Bondage tape is cheaper and better than the crap that yearone sells to wrap up your wiring harness.