westcoaster
Established Member
You could also ask about the train washing facilities at other depots and then let us know.
On the whole FCC tl network including SE there are only 3 wash plants ( Bedford Cauldwell + carriage sidings and cricklewood depot), anything stabled on the SE or south of London can't be washed. Units are hit daily by graffiti tw%ts and it soon adds up, and if like now it's quite cold the units can't be cleaned as the product used cant be used under a certain temperature. Also the unit might be out on a diagram for several days before it can get back to Bedford for cleaning ( if the mess is rude or offensive the stock should not enter service, and run back to be cleaned).
In regards to southern's stock nearly every depot has a wash plant, so some trains maybe washed more than once a day. They also have a specific cleaning shed at selhurst where units are given a good (acid) wash by hand and brush every now and then hence why some units are sparkling.