If your car is under wraps and only taken out on nice days, there's no need to clay it or use any kind of abrasive..I think that's what MMC is referring to...actually, there's no need to put anything on it.
But if you do, I like Meguiar's Ultimate, just remember to apply and remove in back and forth motions to avoid swirls, and touch up after washings with their Quik spray wax.
