Originally posted by solarix
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I haven't been able to find a quantitative measure as to whether or not the soap harms performance, but at this time I doubt that it harms anything when used with common sense. All the informed stuff I see on that subject, suggests some form of soap as part of the cleaning regimen. A Sunpower white paper suggests no ARC deterioration from Windex or other such cleaning products. I suspect the nature of the fouling may have something to do with how particular cleaning products interact with ARC coatings, but if a surface treatment can't stand up to mild dish soap without deterioration, I'd doubt its long term suitability.
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