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DeanMcManis (not verified)    August 13, 2019 - 2:08AM

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Yep, good points John. Beyond the lens optical coatings that can be ruined (as you mentioned) many plastic surfaces have protective coatings that keep off dust, and keep dirt and grime from adhering and staining the materials. But Ammonia can strip off the protective layers because it is caustic and corrosive.

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