Is it just me, or does our Forester's rear window get dirty really fast in wet weather? Been driving a lot this winter and have been noticing that as soon as I pull out of the gas station with a freshly cleaned rear window, it's dirty again! I mean after driving a couple blocks I can no longer see out of my rear window any more! I guess it's a blessing in disguise that I need to fill up every 200 miles(16mpg)! Anybody else notice this? I have the stock mud flaps/splash guards, do yall think that some Rally Armour guards will help?