I used to use a blower brush, but found the silvering to be very fragile. The silvering is on the front surface of an SLR mirror, not onthe back, protected by a layer of glass. Since making a problem much worse on a film SLR, I've given the body to a repair shop whenever I've needed dust removing.
I was very saddened to see my local camera repair shop had closed down recently. I don't know who I'll use next time I need a spruce up.
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