non skid

  1. C

    Non Skid; Black Spots

    How do I get these off the non skid? I’ve tried Clorox, starbrite mildew-mold remover, pressure washer, toilet bowl cleaner, Starbrite, black streak remover, diluted TSP solution, starbrite non skid deck cleaner, starbrite rust remover. Ugh! Thanks for any ideas!
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