How do I clean black off my outside white pavers
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Mold or mildew, I would use vinegar and water in a spray bottle, let sit and then use a stiff palm brush and then apply another coat of vinegar.
wet and forget a safe product for all exterior elements
Try some super clean (most people call it the purple stuff). You can get it by the gallon at most auto parts stores or walmart.
White vinegar mixed with water should get through to the stain. Let it sit for about an hour and then scrub that off with mild dishsoap and a brush.
If all else fails rent a power washer, I clean all sorts of tough items with mine. They don't use a whole lot of water but it certainly does the job.