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I regularly Slick my whole car. It's a QD, that's kinda what it's for, to restore a fresh shine to a car that's clean but has been driven or has maybe accumulated dust from sitting in the garage overnight.
But Hydro is a wax. Slick is a QD. They do different things. I wouldn't Hydro a car to clean it up. I would Slick it. I also wouldn't use Slick as a wax (cuz it's not), I would use Hydro.