Cleaning seawater sprayed filters
The title says it all: How do I clean a Calumet/Hoya multicoated glass filter that has been lighly sprayed by seawater? I tried a bit with a lens cloth and just smeared the mess. I hope it did not damage the coating or the glass. Since regular lens liquids cannot be used, should I look for an exotic hard-to-find chemical or can I get by with a simpler technique?
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