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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.

You need to remove all affected leaves and toss them out, then take out the garbage. before removing them spray shit down with peroxide, touching it can spread it, or use a rag with bleach water to wipe things down like affected leaves before removing them. Altering PH and using a oil/fat can make it harder for things to grow on the other leaves surface, that's why Milk is used "high fat and higher PH", but it stinks, other options are available all with about 30% reduction never 100%. I'd suggest Potassium Bicarbonate + Oil + Dishsoap. Or LABS serum + Oil + Dishsoap Best way to prevent it from growing is keeping your VPD in check and not hitting a dew point or high RH at night. UV lights can also help a as their light waves render spores inactive. It also helps to supplement silicon into the grow as it allows the plants to put purpose to the silicon and move into the leafs surface making it harder for the spores to colonize it. Silicon acts as an armour and reinforcement building block in plants. Stronger. Good to note that once WPM has been identified, there is no getting rid of it. Think of it like plant herpes. Best not to spray anything when lights are on unless its dimmed down to 10% and won't burn them. Normally wet leaves in the tent with LED lights on = Burnt Leaves. I would treat it before lights on in the morning as well, let it dry then turn on. Nest grow you need to nuke the room with bleach or peroxide to disinfect it. and if the spores go outside the tent and then make their way back in it will start all over again. This shits persistent. Good Luck!

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.