I started using the Griot's Garage family of products a few months ago. I like them.
I use Griot's 3-in-1 leather conditioner (cream) that I use on my leather, and it looks and smells great. I use a foam applicator to apply in a circular motion, let it sit for a minute, and then use an exclusive microfiber towel to wipe up the excess.
I use Griot's Interior Detailer spray on every non-fabric and non-leather surface for the rest of the car, applied with Microfiber.
I then use Griot's Vinyl Protectant with foam applicator and microfiber for excess for the dash and other non-leather non-steering wheel surfaces.
I'll look into the 303 for the OUTSIDE black rubber/vinyl parts. That sounds like a good product. So
@Dandy you use two 303 products - one cleaner, followed up by a protector? Got it.