Here's a short video on the UV trial:
As for the tracks, we do have a few of these:
It was just being moved in the above video--the only shots I've seen of one actually working was of the old one.
I've not seen the extent of station cleaning operations, but the last subway car I was on which was last night (I usually take 3 buses to my current work location as it's more direct), was completely devoid of trash and spills after its 30-ish mile trip from Brooklyn. Naturally, one cannot expect them all to look like that under the circumstances.
---PCJ