New battery bought at and installed by mechanic (coulda, shoulda dunnit myself, battery price was fair), new wipers, and new cabin filter (installed by me, yay!). I'll let you guess how gross the previous filter was; I bought the car almost a month ago. It's in great mechanical order otherwise, no oil lost, can't see any leaks so far, drives like a charm still.
Started to clean driver's side door card, the worst offender. Cleaned the driver's side door seal (it's a coupe), applied vinyl / leather protector and let it have a bit of a sheen, detailed a bit of the interior of said door. The door got frozen shut but luckily the passenger door not so much, so hopefully this does not happen again thanks to these steps... because my contortionist skills suck.
I so badly want to clean the engine bay but I will have to suffer for a bit more as winter has become harsher and I can't find a spot for now to do it proper.