Originally Posted by
wickerprints
I've said it before on other forums but the single best method for cleaning optical surfaces is collodion, the method of champions.
Look it up here:
http://www.webari.com/oldscope/atspages/techtips.htm
The way it works is very simple. You basically pour it on the lens, let it dry, and peel it off. It works 100%, leaves no residue or streaks, and has no risk of scratching or damaging the coatings.
Then again...I looked here as well, and found a very negative report of this method:
http://www.cloudynights.com/item.php?item_id=1304
So make of it what you will.