Check this out
http://www.wwnorton.com/astro21/sandt/optics.html
I cleaned the kitchen sink really well then ran the mirror under the tap for a bit then added a couple of drops of dishwashing liquid to distilled water and poured this onto the mirror, then dragged (under its own weight) a piece of sterile cotton in a circular motion from the center out, I repeated this once (my mirror had quite a film on it) then I sat the mirror on edge on a folded teatowel (still in the sink) and rinsed thoroughly with distilled water, at this point there were just a few drops sitting on the mirror surface so I carefully wicked them off with the corner of a tissue.. after this my mirror looked really bright, by the time I got it back in the scope it had dust on it again
