On Sun, 01 Apr 2012 17:54:00 +0100 (BST), "Dave Liquorice"
wrote:

Road film is remarkably resistant to simply being blasted off. You
still need some form of rubbing to get it off, either a brush or
cloth. If just pressurised water was enough do you think automatic
car washers would have
great big rotating brushes?

Traffic Film Remover - the real stuff, not the weak as **** stiff in
Halforts, is really good at that.