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"Petroleum jelly: This product works better if there are too many squirrels in your area, and you want to keep them away from your bird feeder poles. This is the best defense technology that is available for the bird feeder. You will have to apply petroleum jelly on your pole after cleaning it every time. Butter: Though you must spend more for better, it is an excellent choice. You need to apply it regularly to keep the squirrels out of the pole."
<https://www.birdinginformation.com/feeders/>