This is my current build, and my first attempt at that hairspray method.
Note: I wasn't sure about the hairspray, so i did a light coat of panzer grey first.
Then Tamiya acrylics for the camo
Then the white wash
At this point i read your suppose to use water to scrape off some of the white.
However this didn't work for me at all, and was forced to use rubbing alcohal.
It looks ok, i think it will look better with some weathering next, we'll see i guess.