Are there any chemicals that will kill aphids on my water lilies.?

these piercing sucking no accounts attack my water lilies and before I know it there is nothing left. I was wondering if there is any chemical that would kill those `~!@#$%^&*() and not kill my koi and gold fish.
Ther's just gotta be a way.

Answers:
please be careful, i just saw 2 or 3 answers telling you to use soap i hope you already know not to ever use any soap around any fish i have aphids too all of a sudden and they are really chowing down on my lilies and lotus, wonder if it has anything to do with the temperatures we've been having
anyway, what i do is overflow the pond and with the spray nozzle on my hose i blow them off the plants and out of my pond, also
when i knock them off the plants the fish eat them

Other answers:
there are dozens of chemicals out there for that purpose as well as other natural remedies like soap and water and neem oil.

Also, you may note that certain bugs can get rid of the aphids, like dragonflies and certain wasps/bees.
there are dozens of chemicals out there for that purpose as well as other natural remedies like soap and water and neem oil.

Also, you may note that certain bugs can get rid of the aphids, like dragonflies and certain wasps/bees.
try soapy water (luke warm water with dish wash liquid dissolved in it - as if you were doing dishes)

Pour it over the plants/aphids.

This smothers the aphids and kills them.
can you take the lillies out of the water? if you can try spraying them with dishwashing liquid and water mixture in a spray bottle then rinse them off before putting back in the pond....
I'd mix up some water with a small amount of soap and spray them with that. Try it and see if that doesn't work, it shouldn't hurt your fish hopefully.
Submerge the leaves and flowers (if any) underwater.Either the fish will eat the aphids or they drown.
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