I just use a damp cloth. I haven't found a "armorall" type product I like yet. Too streaky and greasy. Armor All made a no streak formula or something a while back and I can't find it anymore.
My girlfriend used to use a damp cloth then a dry cloth and then just a little Wet Tire by Eagle One on her dash for shows. It looked REALLY nice but I wouldn't use wet tire on a regular basis.