Why not replace the smudge with a good feature instead?
Steps:
1. place hud markers actually on the HUD of helmet
2. remove smudge
3. add an automatic optical filtering code to the cockpit glass, becoming more opaque when hit with high intensity lighting (to protect your eyes)
Steps:
1. place hud markers actually on the HUD of helmet
2. remove smudge
3. add an automatic optical filtering code to the cockpit glass, becoming more opaque when hit with high intensity lighting (to protect your eyes)