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I've been happy with the Adam's "Graphene Detail Spray". But I have a newish coating on the Z4 (DIY) so it is probably hard to tell which one is doing the job. It goes on and off easily and is a low enough % that you don't need to be too worried about leaving something behind that you didn't polish / buff / whatever you call it. I do still spray it on the towel down wind just in case.
I also started putting it on my X3 that has a bunch of Zaino on it, and can tell it beads water / snow is easier to remove longer than the Zaino itself ever did. I know you're not supposed to put one type over the other but for that car I don't care a ton and it has actually been working. I tried it as a test and am glad I did.
Typically I just use the normal car wash soaps but have a "strip wash" that you supposedly use once a year, but I haven't had the Z4 a full year yet so I'll give that a go this spring.
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