How to get rid of squirrels in my planters?

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I have several planters both in front and back of my house. I'm fighting a losing battle with these rodents. Cayenne pepper on the soil helps but if I don't cover every single square inch of the soil the squirrels will use that inch to dig in. And then it rains and the pepper seems to lose it's potency. Any suggestions and will this pepper all summer hurt my plants? Mostly annuals. Thanks
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