The adage used to be 'rank hath it's privileges'.
Perhaps that sort of approach worked a bit better when the officer/OR balance was a bit more triangle shape but please do tell me again, whats the ratio of officers to airmen in Her Majesties (ever so modern) Royal Air Force?
Perhaps one of the lads can clean the car after he's finished doing his fifth period of guard of the year, shortly before he goes off to Afghanistan but not before he pushes a couple of shifts on the recently LEANed AEF.
Anyway, none of our commissioned brethren have answered the question. If he's used an MT vehicle he must have signed MT orders, by not returning the vehicle washed he is in violation of MT orders is this not so?
Perhaps its like one of those high spirits/blatant vandalism things.