Washing your caravan (from the roof... with a pressure cleaner)

While caravanning at Capel Sound Caravan Park at West Rosebud in Victoria for two weeks with three mates we saw the strangest happening. A chap with a Jayco Sterling had connected his Karcher pressure cleaner, climbed up on the caravan roof and proceeded to give it a big wash. We were absolutely blown away that anyone would consider walking around on top of a road caravan without causing any damage to the van or the operator.

Unfortunately none of us had a camera away with us.

Has anyone ever seen anything like it?