Hi §AB,
Yep, I find mirror cleaning scary too -- even after all these years. I really only do it when I have to. But ...
Little harm will be done with a wad of clean cotton wool if it is dragged across the mirror only with its own weight (after a really good rinse). Work from centre in straight lines toward the edge. If there is a spot on the mirror that refuses to budge after a good rinse and a very gentle wipe with the cotton -- leave it.
Look for a deteregent that is free of additives and is therefore pretty much pure soap -- probably like the horse soap. The additives are usually there to soften hands etc and are more likely to leave a residue on the mirror. As a rule of thumb, cheaper detergents are better. If the mirror is overcoated there is very little likelyhood of you doing damage to the surface if you are reasonably careful.
As a last step, consider dousing the miror in isopropyl alcohol because it drives off the remaining water, dries quickly and does not leave dust-rings on the surface (as water almost certainly will).
Best,
Les D
Contributing Editor
AS&T
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