blackwolf, here's a link with a couple (6) different camo schemes on KTs (not to mention a bunch of other german afvs)
http://bsdi.usppp.com/wwiiscalemodels/schemes/panzertarnung.html As for white wash, you can use white PASTEL (not oil) chalk diluted with water. However I will caution you to try it on a "junk" model first, it looks like there isn't much on the model til the water evaporates. You can then use a stiff bristled brush to "scrub away" any unwanted chalk (i.e. you put too much, to show wear and tear etc.) The good thing is if you mess it up, or put too much on, you can just wash the model in water to get the chalk off. Personally I paint the base color (I used acrylics mostly). Then dilute some MM Acryl Flat white (resonably thin maybe 1:1, haven't measured so you have to experiment a little) then I just use an old brush that I cut the bristles a little short on. Brush/scrub it on like you would expect a real person to use a broom, branch or whatever. I was happy with my results. Hope it helps!
these are the only pics I have of a winter camo scheme, that I have done, sorry the detail isn't better. (btw this is still inprog)