Had an 8 car 377 last week which was a mess of commuter stuff, eg Standards, coffee cups etc etc. Even a few left banana peels. Two cleaners in Ore sidings did a great job and when we came back into service was almost spotless. Then a couple of blokes got on a Bexhill and one then threw up all over the inside of a door, and it was not the watery kind. :-x Could not even get near to lock the door out of service so had to jump out and warn any passengers boarding.
TBH, the messiest ones are ones coming out from London about 17.00-19.00 when they get to their destination. Last friday night was good for paper, cups, bottles, wine bottles, disposable cups, crisps and snacks, many dropped and ground down, balloons, party hats, streamers orange peel and banana skins, burgers, chips, wasabi* noodles, kfc, etc etc . We were late getting into Southampton, so no cleaning, so had to take the whole mess back to Brighton, where young folks with their cartons of beer and wine then added to the mess. By the time we got to Brighton at 23.40 ish. YUK!!!!!!!
*, yes, i know I go on about Wasabi noodles, but folks never ever eat a whole tub and leave them on the train to stink the place out. At least with burger king, etc most folks eat them up, so while they wif while being eaten, they get eaten. Half eaten Wasabi cartons just stink the coach out all the way.