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Pure isopropanol is best for cleaning optics for one simple physical reason, it evaporates at such a rate and the resultant cooling does NOT condense foreign matter from the atmosphere. It has a protective 'cloud' that stops extraneous contaminants from condensing and sticking to your optical surface.
Ethanol is just as good at cleaning but the high evaporation rate causes condensation of contaminants.
The amount of a contaminant needed to ruin an optical surface to a visual inspection is miniscule (this barely affects performance) but over agressive cleaning will ruin it forever..
BErt
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