[Dog Star (Phil)]

OK. I've tried a forum search but I've either used the wrong parameters or there really isn't anything about this on the forum as yet.
I've got two specific questions -
1. What is the best method for cleaning binoccular lenses - ie, do I need to use distilled water, would methylated spirits be better, can the lenses be wiped with a soft cloth or is that a no-no, is there any danger of water or cleaning fluid getting into the body or housing, is it better to remove the lenses for cleaning, if so how, or is that a no-no too?
2. I seem to remember once someone telling me that binocculars can and should be collimated. How does one do this?
The objective lenses on my nokkies have picked up a grimy film from dew exposure, I think and it's not the sort of thing that will respond to a lens cleaning brush.
I've also noted that focusing on a mountain top at a distance of several km's produces a faint but annoying purple line or sillohuete where the mountain top meets the sky so I'm guessing that something is out of whack.
The nokkies concerned are AOE 20x80's, if that is relevant.
Any advice would be much appreciated. Cheers.