Here's a few more ideas you could try!
Hold the mirror vertical and use a end of a wooden dowel, gently tap the back of the mirror to help loosen any heavy particles as well as dust. Use a vacuum cleaner to collect.
Line the inside of tube with plastic covered cardboard to protect the matt paintwork.
A bellows type foot pump, (for air mattresses, etc available from K Mart for about $6.00), provides oil-free air.
If possible, heat the mirror up by gradually using warmer water to around 40C. This should soften any grease or oil before adding detergent.
Cheers!
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