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I use the distilled water approach as well. When I had an obsession, I cleaned the primary while it was still in the mirror box and just lined the mirror box with black plastic so that the water could fall away.
1. I used a puffer brush to get rid of any grit on the mirror first.
2. Next I'd fill a spritzer bottle with distilled water and a single drop of washing detergent.
3. Tilt the mirror at close enough to vertical and spray it with the distilled water repeatedly, and let the water run off. That got rid of any contaminants that could cause damage in the next step
4. I put the mirror box back to the horizontal position, and filled the mirror with distilled water / drop of detergent solution and let it stand a while
5. Tilt the mirror and let that water run off, and spritz it again
6. Fill the mirror in the horizontal position once again, and then use strips of cotton wool (the sort that you buy in rolls) and gently drag them across the surface of the mirror under water...only under their own weight.
7. After one pass, discard the cotton wool and get a fresh piece. Continue on until the mirror has been gently wiped clean
8. Tilt the mirror and spritz it again
9. Keep the mirror tilted and let it dry, using the corner of a kitchen towel to wick up any droplets that remain
It sounds like a laborious task, but it's easy. If you can remove the mirror it's a little easier, but you have to be a little more careful handling the mirror out of its cell.
I have noticed that the mirror in my XX14i is getting filthy as well so will be cleaning it soon. I think its been getting condensation in the mornings and am still coming to terms with what I should do to combat this.
Dean
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