the basil is powdered by sifting through a fine mesh screen, (colander) and i put it in a salt shaker (mixed with the diatomaceous earth) and sprinkle it around the bed and around the dog's beds. kills most and repels what it don't kill.
but for high up repellent, i use white vinegar and lemon juice watered down a bit in a spray bottle. anywhere it goes, spiders will not. (no more cobwebs) re-apply yearly or as needed.)
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