Then the "new" crud must also be "reacting" with the mirror then as it accumulates eh? After all, it's more or less the same breed of dirt and dust. It's going to pile on as soon as the mirror is out of the tub whether or not I swiped it with the cotton.
It's a damned if you do, damned if you don't situation.
In any case, I don't think dirt and dust is going to do damage to the mirror, we are not talking about chemicals here. If the mirror is cleaned every year or two for example dirt and dust is not going to tear up the coatings or anything like that.
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