I am growing herbs outside here in SW Georgia. Everything doing fine, but I sprayed the herbs (and my other plants) yesterday with a Dawn/water solution in a sprayer (for bugs). I've done this before, but not with herbs. This morning I see the leaves on the basil plants are turning black. Can I assume the soap solution wasn't a good idea for them? Can I still eat them (not loving that idea)? Should I pick off the bad leaves?