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If you pressure wash the patio and remove some of the sand you can go to a local supplier for pavers and they will typically have bagged joint sand that you can use. Unless you remove 2/3 of the joint sand I wouldn't use polymeric sand because it might pop out in winter. Ask your supplier about what they would recommend doing. There are many products out for sealing sand or cleaning. Stabilized sand will be easier to clean than regular joint sand.
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