OG Biowar works for me. As others said, you have to be preventative. I’ve dealt with PM in the past - once it sets in, it doesn’t seem to leave.
I use the full OGB line, as directed, and haven’t had any PM come back in three grows. I give a foliar spray and soil drench with the Foliar + Root pack about every 10-14 days, until 3 weeks before harvest (trying to avoid buds in later stages).
For small grows, no biggie. Cost isn’t horrible, and neither is labor. But for a larger grow, it might be time consuming and more expensive. And buy a good pump sprayer for foliar applications!