I only dare to use microfiber cloths on my Sopra 2s. The manual only recommends a damp cloth for cleaning. It's frustrating because these speakers are dust magnets but I'd rather take a few minutes every once in a while (ok, every couple of days) to Swifter the speakers than to completely ruin them with polish. I'd definitely proceed with caution on anything else. Per the manual "Never use solvents, detergents, alcohol-based or corrosive products, scrapers or scourers to clean the surface of a loudspeaker".
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