Wow, here we go y'all!! Thanks. GGhost, thanks for that ah-ha moment. I didn't realize she'd run her fan on a timer for X seconds/minutes. I will do that. Awesome!! Rayth, no tools needed other than a phillips screw driver to get the panel under the glovebox out of the way. There are only two screws holding the back (closest to the passenger's knees, so by "back" I mean the rear of the car) part of the panel, then the front (near where the panel meets to carpet) has two tabs that fit in notches. Once it's out of the way the cabin filter cover has two of those sliding latches like you see on your fuse box under the hood. The only "trick" I had putting that cover back on was seeing well enough to realize I wasn't getting it straight/square the first couple tries. Then I got a flashlight and voila! One end of the cover has a shark-fin shaped tab with a (what's the opposite of groove?) that fits in a groove in the filter housing and that lines it up real nice and easy. Re-slide the two latches and slap the panel back and you're done. If you're forcing the sliding latches, you ain't got the cover lined up correctly. Mine had a blob of leaves and small sticks and cr** that fell out, and the old filter had a MB part number so it may have been OEM, but it was certainly old. Arejohn, no, why do you ask? My smell really was a vinegar-y stagnant-water type smell, on top of the "fog" thing made my mind point to moisture. What are you getting at? I like all the advice/help/experience I can get, hence the forum, yes? Thanks again y'all!!