Ah right, im guessing a more abrasive cleaning method is used on powercars?
No, they all receive the same treatment when they go through the various carriage wash plants at depots. (basically a super-sized car wash).
The 'dynamic lines' power car livery using vinyls was dropped for various reasons, including cost & the fact that as 'smithy' said, after only a short amount of time, the viynls began peeling off at Speed/looking tatty.
Three power cars received the Dynamic Lines livery, 43004 & 43009 which where the two
FGW▸ prototype/trial
MTU▸ power cars & were vinyled up along with a TF, TS &
TRFB▸ & formed to run as a 'mini set' for the 2006 'First Greater Western' franchise launch @ London Paddington.
The third power car was stored 43194, which was in actual fact the very first one given Dynamic Lines vinyls on its 'B' side only at St. Philips Marsh depot to trial the application & look of the Vinyls. It never ran in traffic in this condition & after being transferred to Landore, Swansea, it was later taken to Brush for re-engineering.
The power cars are left in plain blue to minimalise the potential of them looking tatty. They where given a high-quality two-pack paint job in the spray shops whilst at Brush works & the paintwork is under warranty. I liked the Dynamic lines livery on 43004/009, until i got close-up & i could see all the joints in the vinyls.
I am a fan of the blue power car livery because i think they are simple, yet smart & a full set looks very 'trick'.