@catmanblue wrote:
You clean the top of a caravan or a car as dirt builds up on top of it, ie blown up with the wind etc and then when it rains little trickles of rain wash the dirt off the roof of the caravan or car and leaves streaks down the side of it making the sides of the caravan/car dirty. Also if a bird sh1ts on the roof of the aforementioned caravan or car it is best to wash this of so it doesnt damage the paint work and eventually lead to rusty bits.
dont ever take me for a drink