I have a bit left over, so I might reserve a panel to test this on a properly prepared panel with a pressure washer and see if that makes any difference. What I would recommend though is Bathe+, it cleans really well, feels very lubricated and adds protection at the same time. It's a great maintenance product for a well protected car and it'll save you all of ten minutes of your life topping up the HydrO2/C2... Yeah, it doesn't sound that great an idea when I put it that way actually.
I don't have any Rain X, unfortunately, otherwise I would have gladly shown it what a proper glass sealant is like. I really don't rate Rain X at all, as such it is actually blacklisted (along with Rim Wax and most things Simoniz ) from my house so I'm afraid I'm even going to have to object to obtaining even a sample of this from anywhere for any purpose other than having something to throw at the neighbours intrusive cat.
I agree with the Rain X. It smears and leaves a film on the windscreen that's quite dangerous I found. I threw mine out and will definitely never use it again.