Just be sure to rinse off the oil soap before the plants get any sun, Donald. It can make the leaves burn if you leave it on. Once you've sprayed the plants, you can rinse them off about 10 minutes later. It's a contact insecticide. Also, be sure to re-treat the plants within about 5 days to get the next generation as the eggs hatch.
Once you've got the infestation under control, the regular spray with the hose should keep them away.
