I've been perusing some photos actually Melchie old chap, and had spotted that dribbly bottom effect, and also about 2/3 of the way down the engine nacelles, there's a vent of some sort on each engine, which seems to dirty up the rear 1/3 of the nacelles. Other than that, they seem quite clean.
I've masked & overpainted a few panels & some of the flaps with white to give them that "just replaced" effect, but I thought it was a little OTT, so oversprayed the wings again to mute it down. I'm reasonably happy with the paint finish now, so will probably decal it later tonight, floating them on Klear, then Klear the whole airframe, wash the panels, and apply some small amounts of dirt
I've managed to pull four decent wheels from my mould, and am just in the process of painting them up. Washed with black wash, they look quite smart