The question Did any lander or rover photograph the sun rising or setting during a Martian dust storm? makes me think of the images below showing the stuff blown around and on to martian rovers.
I'm guessing that when propelled by high speed winds the most abrasive and smallest particles could do some damage to protective optical windows.
Question: How are optical windows† on martian rovers protected from hazing due to abrasion from martian dust storms? Are they made out of
old iPhones sapphire or do rovers "avert their eyes" during a storm, at least those that are moveable? Or both, or neither?
†covers over various science and navigation camera lenses as well as laser ablaters, light level meters and whatnot.
above: even the inclined surface of the high gain antenna seems covered in dust! Cropped from Phys.org's Curiosity says farewell to Mars' Vera Rubin Ridge.
above: "The deck of NASA's Mars Exploration Rover Spirit is so dusty that the rover almost blends into the dusty background in this image assembled from frames taken by the panoramic camera (Pancam) during the period from Spirit's Sol 1,355 through Sol 1,358 (Oct. 26-29, 2007)... Dust on the solar panels reduces the amount of electrical power the rover can generate from sunlight each sol." From here.