i am currently treating aphids indoors with a "dawn" soap spray. i sprayed all of my plants with it a few times. i then washed off the leaves with a moderate blast from the hose. i couldn't help the runoff getting into the soil.

today i noticed that all of the new growth green leaves are suddenly starting to fall off. the spray solution is the only thing that has changed, that i can think off.

is there any way to stop the leaf drop? should i flush the soil? any suggestions? is the spray solution bad for the soil? i have aphids on a few hundred radishes and lettuce seedlings, which i can't spray soap on and protect the soil runoff at the same time- how can i fix that problem?

ladybugs are a last resort, as my wife won't be very happy with 1000 ladybugs loose in the house.