Like I said, I'm pretty sure this is probably a re-pop of Shanhai Dragon's old Brummbar. That kit did have some real issues, most notably the front glacis plate which needed to be beefed up with a big slab of styrene card, and PE rails. The TC hatch interior was pretty deficient too.
The whitewash doesn't look terrible, just spotty. I figured it was brushed on. To be honest though, I've done many brushed-on WW finishes, but you have to thin the paint and let it run, like thr real slop would do. And just be consistent in your coverage. The thing is, hairspray technique is more for chipping rather than the gradual wearing away of a cheap WW cover. I've achieved better results with judicious dry brushing and select re-painting of details in the base colors. It's tougher to do it that way though when you have a camouflage scheme below it though, like you've got there.
You might be able to soften some of the contrast with a light wash of raw umber oil on top of the WW parts. That might blend it a bit more, and then you can go back in and re-apply some white streaks and chips over the muted parts to get a nice depth to the WW?