If my mirror looks dusty, i'll let it go for 12 months before thinking about washing it.
After removing anything above the laundry tub, throughly srubbing it, wiping it again with metho then drying it out with lint-free cloth, clean the plug or buy a new one. I'll then remove my rings, etc and use rubber gloves whilst handling the mirror, (in case of any oils, dead skin, etc), then fill the tub about a quarter with warm water...I then mix one drop of dish washing detergent in a cup of water, and use only one teaspoon of this and add it to the tub, allow the mirror to soak for about 10 minutes then drain, rinse in warm tap water then tilt the mirror and give a final rinse in distilled water, touch any large drops with the corner of a rolled up kleenex without touching the mirror. Whatever's left behind, if it's only a few specks can stay there..As I've learned if a mirror looks dusty when you shine a torch on it, there wouldn't be enough to cover the head of a pin!
The last time I tried this I had a piece of oily grit stuck near the centre of the mirror (which would have been in the shadow of the secondary and therefore won't affect the image) but I chose to remove it anyway for fear it could move, I did this by damping a corner of a rolled up kleenex with isopropyl alcohol and dabbing it gently 10 times..after about 10 attempts it was gone, another rinse in distilled water and presto!..nice and clean!
Cheers!
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