Clean as in simply 'not dirty' - no mud and grime?
Or clean as in washed, waxed and valeted?
Liked the story of the RCDS visit where some unit was ordered by the Staish of the place holding the visit to send a 'clean aircraft' for the RCDS lot to gaze at.
So they did. Reasonably presentable, but no tanks, pylons or warry things. Staish went nuts - and over came a truck containing all the bolt on goodies and the lads with the spanners!
This officer v the rest nonsense is a bit OTT. There are the traditional courtesies of the service, but would any officer push past a line of airmen queuing up at clothing stores, for example? I bŁoody hope not!
Clean your own boots!