It looks awesome!
I think if you do a nuln oil wash it'll be fine, for "dirty"; can also do a bit of agrax. I'd recommend starting with half water/half nuln oil, so you can build it up to where you want it.
Then go back over your edges and sharp bits with your base and you'll be good.
It's likely going to look really startling until you get your weathering in.
However you end up doing your weathering (powders, sponge and paint, GWs tech paints or a combo), it'll be quite a lot dingier in my experience thereafter.
I had quite a similar problem with my orange as it was really vibrant before weathering. Nice thing with your white, and even blue, the rust and scratches etc will definitely have a nice strong contrast!
Can't wait to see more of it!
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