Q-what type of milk?
I was just gonna suggest this same thing. Dr enzymes is good shit! Can also do the peroxide was and such after harvest as well to get rid of anything leftover/ impurities.
I just used 2% but I think the key is to “activaite” it by leaving in full sun for a hour or so. Also after spraying left in full sun for 5 + hours.
FYI: I have tried the peroxide treatment past 3 days on a flowering plant but it did not work for me.
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Baking Soda to raise the leaf ph will help combat powder mildew in flower. . If not in bud I’ve found doing a couple sulphur burns twice with a 3 day break between burns then a spray of baking Soda / water mix .
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I have succeeded with buttermilk, but two years ago I met Cease, this product rocks, I frikkin love it.
Here I use LAB as a preventive, in fact I use it in almost all watering of plants inside and on vegetables that are outside in the garden I also give it to animals, dogs and cats and sometimes I even drink, one thing I can say is , it is not bad for the health of plants or animals. 
thanks for answering my question
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Update Sept 21:
Ok gave a second milk treatment on Sunday, really nice sunny day… on Monday gave them some composted tea and misted them with water mid day to rinse off treatment on another nice sunny day.
This morning took a look and they are a nice healthy colour, growing very aggressively and no sign of pwd what so ever. There is still signs of treatment residue and will mist off again today to keep from watering heavily before rain comes in later this week.
So for me, this worked but I jumped on it first sign, and applied in near perfect conditions luckily, so your results may vary.
If it hadn’t, my next treatment would have been with a chlorine dioxide fog that we use up north to sterilize for mould and for HACCP. The tablets are super cheap and you can use the mixture in a spray bottle or a fogger.
I want to thank everyone for suggestions and advice, much appreciated.
I am always looking for a DIY recipe or something as close to organic where I don’t have to add a product to a closet full of them I have bought over the years and used once.
Forgot to add there is a DIY air filter using a box fan that will clean hundreds of Sq ft. I saw it on This Old House a year ago. Not sure if this will capture the pwd molecule but maybe possible if you use a MERV -13 filters.
Sparky Watts
Could you provide a link to these tablets as to where there available. Thanks
I have used dilute bleach for small test applications. Worked well.
I use lost coast plant therapy. It works great.
Don’t have a link as got them from work but I think if you Google “Chlorine Dioxide tablets” I saw several, even one that comes with a spray bottle.
The ones I have are called/referred to as MP1’s
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Looks good but won’t ship to Canada…
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Use Bacillus Subtilus solution, you should be able to get it from the grow shop. It will eat the mould.
Increase the amount of ventilation extraction to lower the humidity, drop the amount of evaporated water by using a coir shield on the top of the pot and cut any affected bits that won’t recover out.
Kill dat shiz immediately!!!
This is one of the most low impact but most effective, I think…have put coco coir to use asap and when you let a bacteria kill another bacteria (Bacillus Subtilus promotes gut health I think… could be wrong, again lol) is genius!
This has been the worst year here for humidity and heat.
Cheers
Sparky
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Ok so to conclude this thread here are some observations on the above experiment.
These were my neighbours plants, started from clones and grew outdoors
in soil and fabric bags. They started to develop PWD late August after a 7 day stretch of humid and hot weather.
After using treatment described in posts above I noticed the sun dried the milk to a clear, glossy coating with that distinctive “baby smell”, Anyone with kids will attest to this.
It is this slippery coating along with a brief time where the sun interacts with the milk proteins to form a antiseptic effect. This makes it hard for the spores to land and take hold afterward. I am not a botanist so this is purely conjecture based on constant scrutiny the last week.
The leaves that were infected did yellow up quickly and were easier to identify and remove.
The weather has been humid and rainy but plants are now thriving and stacking buds like crazy. Fingers crossed.
Thanks all for your replies, advice and remedies.
Sparky
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Bleach bleach bleach!
Yes diluted bleach solution is also viable in the right concentrations.
I just lost coast plant therapy. It’s an essential oil mixture.
Update:
This fall most of indoors plants in my neighbourhood suffered from PWD,
I luckily escaped except for one Bruce Banner auto that I had to take 2 weeks early.
Most tried some sprays on this list with no success, I cannot say if they were properly applied…finally what seems to work for us and does not let PWD come back is a miticide with sulpher that can be applied as a spray (7.99 plus tax Home Hardware Canada) Sprayed plant in bath tub and left a fan on not directly on plant and in dark just before flip into flower. Left to dry slowly left a coating on the leaves. Only plants treated this way never had it return or had bud rot.
Myself, after the BB Auto fail, I bought this and left in closed room for a week after mixed in a large open pot, not sure if it helped as I am the only that tried but have had no PWD problems (knock on wood).
I also used spay as well.
Sparky
I actually like using canned evaporated milk. I mix 1 can to 1 can water. The resulting mix is then cut 1 to 1 with water…that’s spray ready.
But I only use milk outside while in flower, everything inside was sulfured a while ago and I’ve never seen PM inside again.
Thanks Joe!!! 
edit in… One thing about using milk is that it needs to go on early with at least 4-5 hours of sun/light after application.
Do plan on washing your bud if you use milk and you’ll see why after you do it
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