You'll have to explain to me why the EK guys don't have a problem with it?
the fuel may be -15 on arrival but after you refuel with substantially warmer fuel that theory is blown away, so hosing it off after refueling would be a good idea.
Hey if the conditions aren't right ie below zero then yeah, but tap water could very well be 10 degrees warmer than ambient, it will melt the frost/ice, it just depends on how much ice you have and how long it takes.
I have no doubt if you splash a bit of water on it, your right it will freeze onto the ice, however if you keep running water over it and with a tank full of warm fuel it will melt. Perhaps no one had any patience since adam was a boy.
BTW have you guys ever had a problem with ice/frost on a rainy day? in OZ i mean.