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A strong solution of bleach in water. Use 1 cup chlorine bleach per gallon of water. Mop it on the surface, let it stand for several minutes, (up to half an hour if doesn't dry in that time.) Then rinse it. If it's not an enclosed patio, use a garden hose to rinse it with a sweeper nozzle. Otherwise just lots of fresh water and a mop.
Bleach is very slippery, so if it's possible to mop the bleach water on and walk on the area not bleached until you reach the edge that is the best bet. Otherwise wear shoes with a non skid sole.
