He is presenting us with his Panther G Late version from Tamiya which he build OOB.
Here is his description on how he did the white wash:
Quoted Text
It has been build OOB and I indented to represent a white wash with a heavy
weathering. For that I first painted the vehicle in the standard three tone German camouflage (Model Master), clear cot, decals and then I over sprayed a coat of satin white (Humbrol). Then when the white was well dried (two days). I gave a wash of clean thinner (turpentine) and let it a couple of minutes to
soften the white paint. Then with a good quality brush I gave strokes where I wanted to remove the white paint till I obtain the desired effect. When this was finished I let it dry for one day and then I gave a general oil wash using a mix of browns, rust and ocres. After all a general coat with matt varnish an then in some parts to accentuate the effect I used pastel chalks.
You can find the On Display here