I drive a lot in heavy snow. Mirrors have to be clean and unobstructed to work. During winter, before I get into my car in the morning, I have to clean the mi

I drive a lot in heavy snow. Mirrors have to be clean and unobstructed to work. During winter, before I get into my car in the morning, I have to clean the mirrors. The rear view mirror is often compromised by my rear window being gunked up, overwhelming the wiper. So as for failure modes, nah, not terribly worried.