Dauber makes a good point there about the actual mechanics of machines:
Moving parts exibihit wear, weathering and dirt differently to static parts.
It is also worth considering areas which are touched by crew/mechanics a lot - such as refueling caps etc
Dirt will be smudged by fingers around the cap, although there may be evidence of fuel spillage. Also, the edges of the cap itself may be chipped from constant opening and closing.
Remember - God is in the details
Moving parts exibihit wear, weathering and dirt differently to static parts.
It is also worth considering areas which are touched by crew/mechanics a lot - such as refueling caps etc
Dirt will be smudged by fingers around the cap, although there may be evidence of fuel spillage. Also, the edges of the cap itself may be chipped from constant opening and closing.
Remember - God is in the details
