When it comes to powdery mildew you must control it.
It's systemic which means once it's in your plants it's got it and will never know away.
Kinda like herpes in humans it's still resides in the plant but you must control it.
I like to use simple dish soap and a sprayer. Once the soap hits it the powdery mildew quickly washes off with some water.
https://efraingardening.com provides more information on this and other easy gardening hacks.
Personally he has taught me in person. Why? Because he's my gardener and has taught me a bunch of really cool tricks he's learned from owning his own gardening service.
He's a local guy nothing fancy but he sure as heck does have a green thumb.
Anyways check their page out especially If you are in the San francisco bay area.
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