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I am strongly in favour of rarely washing mirrors and only when they really really need it.
In my opinion there are 6 possible outcomes when you go to clean a mirror
*Everything works fine and you end up with a clean properly reinstalled mirror
*You get a clean mirror but mess up the reinstallation (or similar mishap)
*You do a poor job cleaning and leave dirt/spots but reinstall poorly
*You do a poor job cleaning and leave dirt/spots but reinstall well
*You clean poorly and scratch or damage mirror and reinstall poorly
*You clean poorly and scratch or damage mirror and reinstall well...
Of those, 5 are "bad"...
Not to be alarmist or scare people because I do believe that mirrors and other coatings were made to withstand some "common" cleaning...but a mirror does not need to be washed weekly or monthly...heck, I don't even clean them annually (unless they need it)...I only do it when they are dirty...it will take a signifigant amount of dust to degrade the view...
It is a sometimes necessary task and when it needs to be done feel confident in doing it...but, a mirror can go a long time before it "needs" to be cleaned (my opinion)
Good Luck All!
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