Just a reminder though, this wash your own vehicle is NOT new. 'twas always thus as far back as I can remember.
Usually the order was honoured in the breach and not the deed. Can't remember a sqn waggon pre 1980 being washed. Remember being astonished at a JO in 8 washing one. Then in the late '80s at Waddo - drive to Germany, drive to Zeebrugge, ferry to Felixstowe, drive to Waddo, wash vehicle.
Really we should have just shoved it through the local car wash. Then again, do you ever get a good clean on your own car, in winter, after dark?