Does your car have issues that would even require wet sanding? If so, Zaino won't help it. Meguiar's won't help it. Nothing you just pour out of a bottle will help it if it really needs wet sanding. You really can't even level orange peel by buffing because the tools used in machine polishing will actually conform to the highs and lows of the orange peel. You need to block sand to knock the highs down and level the paint, then compound with a rotary to take out the sanding marks. But as sonoros pointed out, most factory paint jobs have a very limited amount of clear and wet sanding usually isn't recommended. Yes, there are those who do it, but it leaves precious clear behind for future polishing. Now, if you're talking about some spot touch ups, that's a different story. I've done that on my own cars a few times with excellent results. Not sure I'd want to do it to the whole vehicle though.