For stuff that will not come off with a blower, I put the mirror into
a tupperware box fill the box with water add a few drops of detergent
and rock the box back and forth. There are boxes big enough
to hold a cake. A cat litter pan is also large enough. The agitation removes slightly
stuck on dust and spots. However sometimes there is still stuff
on the mirror surface, then I use my finger tip.
One caveat is if your mirror has a clamshell chip, micro pieces of glass
can flake off at the clam site. They are small enough to be suspended in
the water. be careful not to drag them across the surface of your mirror.
Rinse with distilled water, hold on edge for awhile to let the water drain off.
set the mirror down on an angle, and chase any water drops off with
a squeeze bulb.
Edited by vtornado, 28 October 2021 - 08:44 AM.