I also use Q-tips and isopropyl alcohol, the same process as for my SLR lenses. I use a blower and camera lens brush to remove any dust before using the Q-tips dipped in isopropyl alcohol and a lens tissue to blot most of the excess. Usually finish off buffing with a lens cloth.
Incidentally some chemists (spot the Pome) I mean pharmacies flog the isopropyl alcohol in larger quantities like 250ml for a fraction the price of camera outlets for their tiny 10-20 ml bottles.
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