What sort of bugs? What sort of soap? How strong? That would seem to be the cause.

A jet of plain water from the hose will dislodge many bugs.

They look a little burned from the soap but nothing too serious. If you have caterpillars, use BT.

The only bugs I ever see on my Kale are aphids. And while soap will kill them, it simply isn't necessary. Like flora suggested, sprays of water every few days is sufficient to keep populations at bay.

My guess, also, is that you sprayed with soap and left it on there during the heat and sun. Insecticidal soap is best used in the evening and rinsed off in the morning.

Kevin