I have been using dish deterent for 5 years, as a bug spray, I have yet to see any problems. I found it more versitile than Safers and I think more effective. The first year I tried starting my own seeds, I used garden soil without treatment. I had lots of aphids in my house. I used dish deterent on emerging seedlings and did not affect them, Safers, burned them. Potassium is more caustic than sodium I usually don't get a chance to spray until near or after sunset, so I can not say anything about using in bright sun. Maybe something like a baby shampoo or castile soap would be better. I'll have to try that this year. The basic concept of soap is in soft shelled bugs, it plugs up their breathing pores, Hard shell bugs, clean their apendages, It they have soap on them it gives the bugs terminal dysentery eg they sh_t themselves to death. Byron