I have had discussions with Mark Suchting and others which indicate that the paranoia associated with mirror cleaning is unfounded if your mirror is overcoated, as just about all modern mirrors are.
The overcoat has the hardness of glass and wont be damaged by the gentlest of wiping with soft cotton underwater, given there is no grit there being ground in. In any case you might fing a good rinse is good enough, with the small difference gained from being wiped being lost after one or two uses anyway.
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