Quote:
Originally Posted by rmcpb
Remember that each time you wash a mirror, no matter how careful you are, you do a small amount of damage to the surface so only wash it when it really needs it. Definitely not a weekly task.
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Theres no reason to scratch the overcoating of your mirror if you rinse loose dust off first and use detergent and conton wool in cleaning. If you do make a few sleeks , it is in the SiO/SiO2 overcoat and of course not damaging the actual surface of the mirror.
Leaving an oily coat film of dust and dirt on your mirror actually hastens its breakdown as it is the first thing to attract moisture in damp conditions, and the chemicals via air pollution in the moisture break down the coating.