Search for "Optimum No Rinse". You can find it on AutoGeek, and there are also how-to videos on You-Tube.
I use it when Charlotte is under water restrictions (last couple of summers), and in the dead of winter.
My previous car was a Mercedes C-class, in 030 black. The ONR worked extremely well, without scratching, and it leaves a very nice gloss after wiping dry.
I still use it on the new (white) 328i, and have been happy with the product.
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