All that plus I start application as soon as flowering starts happening. Moths lay eggs on stems and leaves when young, buds develop around the cats as they chew buds up from the inside as the buds and cats fatten up. The BT with spreader sticker is inside on the stems and leaves as the buds fatten up and the cats come in contact with it.I don't know if using soap of any kind will help you with the BT. Unless I am mistaken, all soap should kill bacteria. Also, spraying BT does not guarantee you won't find any more caterpillars. BT only works well with very young caterpillars, and you have to take into account that the day you spray there might be eggs as well. The new caterpillars coming out from these eggs won't be affected by the BT. So they will need a second spraying after 4-5 days.
The bigger caterpillars don't usually die either. BT affects their digestive system and in many cases this just means they will stop eating, but not really die. So you can find many inactive caterpillars that are not tunnelling the buds bud rather just hanging over them. If they have been affected by BT you should also see them mostly inactive and barely reacting to you picking them with the pliers. Probably feeling like shit from eating buds covered with BT.
In any case, finding the first caterpillars means having to manually pick them every 1-2 days for the rest of the duration of the grow, until harvest, BT or no BT. At least where I live.
This has been my experience.
That Haze is developing beautiful colas!