hmm - I just put a few drops - 10 maybe? _ in sprayer bottle. I also have rubbing alcohol in the mix - tho that may not be good for buds. A small amount probably wouldn't hurt, tho may not be helpful either but will help keep the soap from sudsing up
neem oil and orange guard also work well but don't know if they harm buds tho did spray some cym buds lightly with orange guard last year with no ill effects