Hi Mike,
I found a common problem with my mirror is the oil present in the air..from exhaust fumes, bar-b-ques, cooking etc will make their way and set on the primary mirror..so how do you clean a greasy plate?...place it in hot water and use detergent..but for my mirror I place it in warm water and gradually add more hot water to about 30 degrees C..then add the detergent mixture (one drop mixed into 500mls) and allow the heat to soften the oily film and the detergent to dispurse it for about 10 minutes...rinse in warm water and a final rinse in warm distilled water...
Cheers!
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