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You don't need weed killer. Just google 'natural weedkiller' and you can make your own out of vinegar, salt and dish detergent. Mix it and put it in a spray bottle, then just spray the weeds. Wait about an hour or so and you can pull them out; make sure to remove the root, if you can. You could fill in the cracks with sand afterward, but they may not stop the weeds from coming back. A powerwasher will get rid of the weed above ground, but the root will still be there and the weed will just grow back.
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