Agitator Drivers, how do you clean your mirrors?

Hey guys

Wondering if any here drive agitators? I used to do interstate driving b doubles but since meeting the love of my life I've given it up to do more local work. So here I am delivering concrete.

We use a salt based acid to clean the trucks. Over time it gets on the rear view mirrors and leaves what I can only describe as watermarks. Is there anything I can use to remove it? To bring the mirrors back to new condition.

Thanks