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The air flow sucks all the dirt onto the window, all flat backed vehicles do it, nothing can be done. Keep the washer bottle topped up, or dont drive when its wet ;)

I hadn't thought of that. Brilliant! Saves me from flashing my brake lights at the driver behind, too. This is a technique Japanese hypermilers used to apply with the Gen 2 because there were minimal but measurable energy savings. It was described as a 'ceremony' in a post responding to one of mine about traction battery current readings on Scangauge when holding the car at stoplights: http://priuschat.com/forums/gen-ii-prius-technical-discussion/21854-how-many-amps-drawn-when-stopped-light-foot-brake-2.html#post853143 This technique is less important with the Gen 3 as the tendency to 'creep' or 'pull against the brake' when in D was refined. It does take a second or so for this to happen and Scangauge can show this more clearly then the car's energy monitor. I posted a table comparing the Gen 2 and Gen 3 behaviour recently: http://priuschat.com/forums/gen-iii-2010-prius-technical-discussion/100559-observations-battery-current-bta-amp-gen-2-gen-3-compared.html