Quote:
Originally Posted by Merlin66
The new "crud" hopefully will be deposited on new areas of the mirror, whereas if the old "crud" is left in place it can start reactions which will eventually destroy the overcoating and the aluminium coating, leading to pin holes etc.
Just my 2 1/2 cents.
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And not only, that old crud after a few hot days becomes baked on
crud. I go with the no pressure cotton wool, after running water over
the mirror for 10 minutes, then 180 the mirror and go again.
Cheers,CS