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I use what every superstrength dishwashing detergent is under the sink, put a few drops in hot water in the sink , (I put the detergent in the CLEAN sink first , then let the action of the tap make the bubbles and do the mixing) , I then soak some pure cotton pads (I knick them from my wife's makeup bag) in the hot / warm soapy solution and then simply place very gently the soaked pads on the mirror and let them sit there for about 10 minutes, no swirling about (if there's any grit on the surface that a blast of tap water from a syringe didn't shift , swirling might dislodge it and produce a scratch .... not good) , I then remove the pads , repeat the process a few times , this has always removed any marks I've had .
I then rinse several times using a syringe filled with warm tap water until I see no more suds and the water starts to bead.
I continue this process for several more rinses , then finish off by rinsing with demin water delivered by the same syringe (as the tap water rinses) , several rinse will remove any tap water contamination in the syringe.
I then stand the mirror so the water demin water drains off the mirror under gravity , no need to touch the surface , evern better if the aircon is running , it'll promote air circulation and demin water evaporation.
If there is a stubbon deposit or stain .... AR grade anhydrous isopropyl alcohol is the go.
You'll have to fill in paperwork to get the isopropyl alcohol (it's a restricted material).
You can buy the stuff in 200mm bottles , and laboratory grade squeeze bottles can be had too from any laboratory supplier.
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