Some of my trim has cleaned up quite well with Autosol - around the doors and boot. 
The possible leak in the vacuum system could well be the rubber seal on the boot actuator itself. Mine went. I replaced it with one from A8 Parts. Pretty easy to do. And you can confirm if this is the fault with the boot trim removed - you can hear it leaking. I'll post a photo if that helps, but I think there's a thread of mine on this somewhere - I'll have a look.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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