Tire wear is much improved since I replaced the rear subframe mount. The rear tires are no longer wearing rapidly on the inner edges. The previous owner had warned me this car "ate rear tires" and, looking at his receipts, he replaced them repeatedly; apparently none of the tire shops ever wondered why the rear alignment was so out of whack, or thought to notice the bent mount throwing everything out of line.
I also finally fixed the windshield washers, which had been an irritation for a while. The check valve had disintegrated and the pieces had clogged the nozzles. New nozzles were cheap enough that the most sensible thing was just to replace both of them and the check valve, together.
* For any Brits reading: "anti-roll bar"