Funny that this thread has popped up, as I noticed a few 380s looking noticably unkempt externally on trips down to Ayrshire & Inverclyde in recent weeks, the 156s I've seen don't seem quite as bad by comparison (especially the ones that have not long come back from Wolverton). Two that stood out to me this past Sunday (10th May) were 380101 (my train to Greenock West) and sister unit 102 (saw it leave Central on a East Kilbride turn at 1348, 7 minutes before my train left at 1355). The latter in particular bore all the scars of recent graffitti removal, paint lingering on the solebars, some of the white dots missing with unsightly brown scars in their place, filthy windows and just all round looking rather shabby and tired. 101 wasn't much better, I could count the number of windows on my side of the carriage being at least somewhat clean on one hand.
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@RunRepeat beat me to this next part, but it bears repeating all the same)
Why is this the case? A combination of many things as fleet cleaning is far from a simple process: the simple fact that it's a man-power heavy job, the products used to remove the graffitti playing havoc with the vinyls and paint, the quality of the surface finish of the vinyls/paint to start with, ill-conceived or poorly implemented processes on how to apply and then remove it properly, the product being used is even appropriate for this application, which products are deemed 'safe' to use and the drawn-out process of selecting and then getting a alternative through the approval process if not, the varying types of 'soiling' that occur between fleets, depots & regions, the range of carriage structures (door and window recesses/pockets, tapers and so on) and the list of locations where daily and deep cleaning can take place being vanishingly small (local planning permission not being forthcoming to allow for surface drainage being one such hurdle). Combine all that and it's small wonder the fleet is in the state it's currently in.
What really isn't helping here is an persistent shortage of units and thus the need to have as many trains/units out in service as possible to maintain the timetable and not keecap the fleet diagrams, so any units shabby appearence can be roundly disregarded (which neatly explains why I've seen more than one tagged 380 out in service recently). Good to hear that the situation is improving in some part though, and I hope it continues to do so.