That's why I get my lens cleaning liquid (Purasol) from Edmund Optics. I won't trust any others which uses solvent or any other detergent which may damage the multicoating.
http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productID=2520
What's your opinion on Zeiss cleaning solutions?
Also, I've noticed that no matter what cleaning solution is used, some kind of deposit gets left behind. I usually take that off with breath and a clean section of chamois.
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