I’ve seen a few galleries for this model, including an excellent build log on the FSM forums by @ricardoscouts
None of them are going for the white washed look though. If it were me, and I wanted to attempt it for the first time without an airbrush, I would:
-
Get a pencil and draw the rough centrelines of the “blobs”
-
Take a drybrush or sponge brush, pick up the paint, wipe off excess and start blotting/dabbing your white/off-white paint along your pencil lines.
-
Try and keep your blots narrow at first, until you have your pencil marks covered up
-
Expand your blot pattern as required to close up the spacing between your white blobs
-
The dabbing/blotting should give you a fairly rough application, while the drybrush or sponge should keep the edges slightly feathered
I warn you though, I have no experience attempting this effect