HELP, HELP Wash for TSR.2 bomb bay????

I am sort of stuck here.

I have painted the bomb bay in gloss Future in preperation for a wash, but don't really know what to put into the wash, I am thinking Tamiya or Humbrol Acrylic matt grey, water & some detergent, but I am lost with the ratios. Looking at the detailed & ribbed structure of the area I am trying to do I will not be able to do it with a brush, as the area is just to intricate - so I would like to airbrush.

The main wheel well's are also part of the same area & are very visible from the side, this pic will give you some idea;

Advice? Anyone? Please? 

I find that for this sort of work, Tamiya Smoke works well. You need to dilute it with Tamiya acrylic thinner, 3 parts thinner to one part paint. I also add a few drops of acrylic flow enhancer.

I then apply the diluted paint with a flat brush. Not too much at one go, just let it flow into the crevices and recessed detail. Let it dry for an hour or so, and repeat until you have achieved a sufficeint degree f shadow. You can see the effect on the main gear legs of this Airfix 1/72 TSR.2:

Tamiya Smoke is glossy, so you mihgt want to tone the effect down with a light overspray of matt varnish before installing any weapons.

Alternatively, a dilute wash of burned umber watercolour, with a drop or two of liquid soap added, works well, but is a bit more fragile.

Cheers,

Chris.

Appreciated Chris.

My favorite combo is Windsor and Newton artist oil Paine's Grey thinned with oderless mineral spirits. 

Brian

I get the impression that brush is the way to go here as opposed to airbrush?

Yup, brush all the way.  No matter what medium you use (acrylic paint, enamel, artist oil) you want to water it down reeeeal good and then apply to your detail areas letting the thinner do all the work of drawing your paint into the cracks and crevices.  Then you can go in with more thinner and clean up any ugly spots with a cotton swab, brush or rag/towel.

Brian