This ^^I've been told that I can use Safer's Insecticidal Soap during flower. Neem should only be used in veg because Neem oil can affect the taste of your buds.
Safer's needs to be rinsed off but the other 2 don't. I usually spray before lights off and rinsing when the lights come back on.
No neem in flower. Safer's Insect Killing soap is a true soap (not a detergent like Dawn Dishwashing Liquid) and soaps work by essentially dissolving the exoskelton on many bugs including thrips and mites.
As HG says, you have to rinse it off after it dries. But it is only effective wet and on bugs you spray directly. It won't work for a bug that lands on a freshly sprayed leaf.
Thrips are what I battle with most. Good luck with your treatment.