And one obvious potential problem is the lens on the camera you are using clouding up.
From the en.wikipedia.org
The skies were clouding up, however, and we scurried off almost immediately, heading down the Northeast Ridge.
From the thenewstribune.com
The copper kept the water from clouding up.
From the dailyherald.com
Well, not allergic exactly but I found that it would ask me every few minutes to clear the dust which was clouding up its sensors.
From the couriermail.com.au
After that, the brain began a slow decline, clouding up little by little until, by age 60 or 70, it had lost much of its ability to retain new information and was fumbling with what it had.
From the time.com
All the same, there wasn't enough surprise and wow in either Mayer's selections or his fretwork, and there was way too much smugness in his speechifying to keep from clouding up one's judgment.
From the ocregister.com
A few thousand meters to our left, on the edges of the cantonment, the ground was spitting up dust and smoke, clouding the air.
From the time.com
Such zones are expected to filter a mix of fertilizers, pesticides, salts and sediments from built-up areas that wash into streams and, ultimately, the lake, fueling algae blooms and clouding water.