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Its a bit of a complicated formula but you might want to check out the optics cleaning link here
http://www.arksky.org/index.htm
or this one
http://www.astro-tom.com/tips_and_advice/cleaning_optics.htm
Though in the last he contradicts himself by saying "don't use alcohol" then procedes to give a formula for cleaning using IPA
Also check out his "Ten Comandments of Astronomy" You may not have come across it before.
http://www.astro-tom.com/tips_and_advice/ten_commandments.htm
Cheers
Paul
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