The recirculation valve is behind the glove box. With it in "vent" position, outside air I believe comes from the windshield cowl near at the lower passenger corner of the windshield.Air must come in from somewhere, and where? Has anybody tried to clean where the air comes into the cabin? I'm thinking it's a good idea to clean the area. If you know, do you think it's possible to take a picture of where to clean? I don't see it.