I will be interested to hear how this goes.
I have got the white mold on my pumpkins but as it is coming towards the end of the season I haven't worried about it.
If it came earlier I would probably try something like milk (as I don't want to use any chemicals).
From what I have read it works on pumpkin leaves too, I will let you know how it goes. I am always looking for non chemical solutions to my garden problems. Thanks for reading @pennsif!