re: Different idea to handle fine dust on moon and mars....
This sort of approach is already used by motorcycle and racing car drivers who have "tear-offs" on their visors - each one can be pulled off when it gets dirty, exposing a clean layer below.
Problems with this approach are that the act of peeling the film generates very large amounts of static which may attract fine dust in a near-vacuum such as the Moon or Mars.
Anything that wipes, drags, or rolls has this problem.