How to rid black fly organically?

Is there a a simple cheap solution I can use to spray my plants to rid black fly? They seem to absolutely everywhere and it's affecting the growth of some of my plants. I don't want to use the chemical bug spray but if there's something organic that I can make up at home that won't damage other wildlife but be able to wash off the bugs I'd rather do that instead. Anybody tried and tested home made solutions?
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If you live in Derbyshire, as I do.
If you live in Derbyshire, as I do.