[SirSourdough]

This is also done in auto racing, particularly endurance racing where you might pick up 4+ hours of bugs and debris on the windshield over a driver stint.

The windshield has a stack of huge stickers on it that get torn away by the pit crew during stops. Apparently you can get stacks up to about 20 layers.

Seems like a reasonable possibility for messy AR applications.

[taeric]

Of course, you have the "pit crew" do this for a reason. Whatever is getting those dirty is likely getting the driver/operator dirty, as well...