In veg I use dr. Bonner's peppermint soap. 1-5 tabls a gallon of water for foliar spray. Most I use is 2 generally just 1 tbls per gallon. Peppermint is a bug repellent the soap will kill pests if they are saturated. I'll spray my outdoor plants, top soil even cloth pots with it every 3 days or so. If a leaf has a bug or several I'll just saturate leaf. I've also continued its use in flower by holding leaf I'm saturating in my hand using a hand held sprayer making sure not to mist buds. However since soap is organic and outdoors you generally bud wash I dont know if organic soap is just as bad as powdery mildew, bug doodoo bug eggs caterpillars or whatever else may be on outdoor buds by harvest. Generally you never want to get anything on buds that may be inhaled or consumed when used, if you grow outdoors and dont bud wash is smoking pm or whatever healthy. I'll add I'll spray bigger fans not close to buds where as they will not drip on them throughout flower when I spray top soil and pots that peppermint smell isn't 100% by no means but I can tell a difference since I started using it. and if I do have mold on stalks or stems I just adjust hand held sprayer to stream instead of mist and forcefully spray mold off with soap mix. If mold is too close to growth to do that I'll use peroxide on a rag generously and just scrub off.
Soap
Sprayer
Those sprayers are cheaper at like harbor freight