Ray,
I cleaned my 10" Newt couple of times in the past.
Basically, I left the tap water (in thin stream) to soak mirror for couple of hours (overnight), then I applied diluted dishwash liquid and removed dirty spots by gently massaging mirror with clean fingers.. and then flushed it with distilled water.
All water will simply drop from vertical mirror surface, remaining small droplets (if any) will evaporate without trace.
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