We've had chattahoochie river rock on our lanai for several years. Part of the floor is under roof and part under birdcage. The birdcage end will occasionally have a white film here & there due to minerals in the rain water & the outdoor exposure to the elements. I keep a spray bottle with denatured alcohol in it. Do not dilute, & spray a mist over the areas that have the film. Let dry and it will be fine. This helpful hint was told to me by my installer. Hope this solves your problem.
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