This week on Car Talk, Scott in Alaska is searching for a way to keep his windshield clean, and the local salmon population happy. You'd think a couple of MIT grads would know the perfect eco-friendly, wiper fluid solution, right? Well, maybe not so much. Meanwhile, Gregory's Chevy has a nasty habit of stalling when he parks facing uphill--which wouldn't be a big deal, except for the fact that he lives in San Francisco. Also, Cynthia's convinced that clean oil is improving her Acura's gas mileage, and has 100 bucks riding on Tom and Ray agreeing with her; Andy's got a pesky Check Engine light that's ignoring his best efforts to ignore it--and, why you never want to go to a movie with Ray. All this and lots more, this week on Car Talk.