With the understanding that the recipes using either the milk OR the baking soda (not both) are only preventative and will do nothing to "cure" PM, let's review the proper recipes :-)

For the milk solution, use 1 part milk to 3 parts water and just a few drops of the dish soap OR vegetable oil (per gallon of liquid). The oil or soap is only used as a surfactant to help the solution adhere to the foliage.

The baking soda solution: 1 tablespoon of baking soda per gallon of water and a few drops of oil or soap. Mix both solutions very thoroughly before spraying.

Neem oil also works very well to control PM and is completely safe on edibles and an organic/natural control.

Using any of these on a weekly basis will help to control the spread of PM to as yet unaffected foliage but it is really best to start spraying before any symptoms appear. And alternate between the different solutions. The fungal organisms responsible for PM can adapt and become resistant to the same spray used over and over.

Thanks for both the recipes! I always mean to start straying for PM but I'm a bit of a procrastinator. My garden will get a spray this afternoon.