First blow it out, or even better jet: use a very soft brush and a vacum-cleaner.
If there is still a haze use alcohol and a very soft tissue to clean the mirror after that.
Peter
I think the dust and gunk get on the mirror there through a nonlinear flow channel through a 4th dimension quadrant transform. More or less...
My way: Remove the mirror, clean with water and soap.
Use a soft paintbrush and work under water with next to none pressure.
Mind you: not only is a first surface mirror rather vulnerable, the position of the mirror is critical for good, accurate focus too.
Most need their position recalibrated when removed and reinserted again.
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