“Llifebuoy soap deer repellant, we used it shaved in a panty hose tied to trees in the corners of the yard.”
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This works well for a while, as does aluminum pans hung from fishing line. My mother had success hanging twinkle lights around her garden. It seems to me the thing is to change it up. Use one thing for a while, and then another. The deer get a accustom to something and then start ignoring it when they realize it poses no danger.
I haven’t found that to be a problem unless it is the same deer just hanging around which normally means they are sick and need to be killed, in that case we use a bow to take them out in the back yard.