Need to park in filthy, dusty lot at work. (Dust from a stone quarry I think). On my cars, I replace wipers & blades more often than average driver. Replaced wipers & blades on Prius before second oil change. Go to neighborhood parts store. They install. Not sure of brand, I think Trico. Used them on three cars now. Now my point: I now notice a small crescent shaped area on windshield on passenger side where neither top of drivers side wiper nor bottom of passenger side wiper clears the glass. Was this always there and I just didn't notice? Is replacement drivers wiper to small? Does owners manual give info on length of blades? Does anyone here feel like walking to your Prius with tape measure? Thanks.