David...
For some reason almost all of my potted daylilies have aphids this spring. Of course, I didn't have any Safer soap, soooo I took some Baby shampoo, put a squirt into a quart spray bottle with 2 drops of Dawn and then filled it with water. Just sprayed each daylily fairly heavily a week ago with really good results. Today, I just gave them all a light spray to catch any stragglers. By the way, it smells pretty good too.......lol