I'm totally going to de-rail this thread.....
but why reach for Poxy on an un-clayed surface? You'd be doing yourself AND the customer a favor by using one of the Super AIO's available now. Until a few years ago, you'd be hard pressed to find an AIO that would last more than a month. Now there are several options. ZAIO is the undisputed king of AIO durability and it looks killer to boot. It also goes amazingly far. If you are cheap, the reformulated Nu-Finish is a total steal, though I'd put it in another bottle so your customer's don't see it!
You'll end up with cleaner paint, the customer will have a shinier, smoother car and it will be easier to clean next time.