Dirt! Yes, quite a bit of it, too!
Last weekend as we were all working on the wife’s Notchback, we discovered an interesting feature to the system that draws air into the engine compartment on a Type 3.
Well, long story short, it actually is remarkably easy for leaves and crud to get down into that area (doubly so if the car is parked for long period of time as her’s was before we bought it). But there are little rubber flaps underneath the car to let stuff out. And here’s about a pound of dirt that we cleaned out of that area!