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one thing - foliar sprays always "seem" to help immediately after but within a few days anywhere that water dripss, even if it has milk in it, just spreads it around.. it'll be growing under the buds on the stem, for example... wherever that water drips. It make take 5-7 days for those colonies to be visible, but they will pop up along wiht any spores in the air that might take hold in meantime too. Milk will also stink like shit as well as dry up on the leaves attenuating at least some photosynthesis occuring in those leaves. even commercial grade fungicides used on farms has a shitty effectiveness rate. talking 25-33% reduction compared to not applying anything. for a bit iw as hitting dewpoint at night because i was growing too many plants with too weak of a dehumidifier. 80F/50-55% has a dew point in 60s F. If the dehum cannot keep up as temperatures drop after lights out, you hit the dew point. Since i never saw this occurring due to lights being off it took me a while to figuure it out. once i stopped the dew from forming, the wpm issue has not re-occured. I now have a wireless probe fore temp/rh/vpd and i can see 1-minute polling data of each. After lights go out i can see the environmental variables and not interrupte the dark cycle. So, healthier plants with better environment should avoid it in the future. if you don't see it after removing the leaves, just keep your environment in check and count your blessings.

Looks like powdery mildew. Increase the airflow and lower the humidity. You can also defoliate more to allow better circulation. The milk spray is a better precautionary solution rather than a problem solver but it can help with the issue. Whole milk and water at 40/60 ratio. Spray in the middle of your light cycle. The protein in the milk creates antiseptic like properties. It is best to water in the mornings. If run off happens into trays, discard the excess run off before it evaporates. Most of times increasing airflow and lowering humidity helps a ton. I hope this helps.

What Roberts said. 35% full cream milk and 65% plain water. Spray while lights are on, the light activates an enzyme in the milk which will kill the powdery mildew. Massive nitrogen toxicity too, as in waaaaaaaaaay over fed.

Nitrogen toxicity, and white powdery mildew from looks. A water/milk mix for mildew. Then lighten up on feed, and or get more run off when adding nutrition. Lower humidity in grow room, and more air circulation.