Wrong forum, I know. But I'd read about this advanced polymer treatment for metal, glass, etc. called Rejex and used it on my A8 which I frequently have to park outside (too many cars, thoughtless teenage son, etc.) overnight. Applied Rejex a couple of days ago, and sap, berries and all manner of crap just floats off the surface of the car without any wiping even. A 10-second buffing gives the car a deep lustre. 10 minutes to apply, 20 minutes to dry, 10 minutes to buff off. Terrific product available through www.corrosionx.com. And cheap, too.

...to pull the trigger and use it. Guess 30+ years of wax experience is holding me back ;-)