How do you actually deny creeps?

I play cait adc a lot and a good tip with her is to constantly poke the enemy adc, which I do however when ever I go to AA one, I get aggro from the minions and I end up losing more health in return from the minions alone, My plan is, I AA the enemy adc, then i walk back, however these mnions follow you for so long its annoying, any tips?
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