One thing about weathering, most folks go off the deep end overdoing it.
When I was in, the planes looked a little dirty sometimes
real dirt magnet...the F4 Phantom>, but they would be washed and painted
regularly.
Some birds, like the Japanese ones stuck out on the islands for years,
could get pretty grimy. But most ground crew takes too much pride in their
birds to let it go as much as alot here seem to think.