Q.spraying apple trees for apple maggot and coddling moths
I have read about the product kaolin clay to spray apple trees for apple maggot and coddling moths. where do I buy this and what brand name is it sold under. also is there any other products that I could use for this prevention natural or otherwise. when would I spray these products I live in western Washington State

I would, actually, recommend either dormant oil, or neem oil for this application. You should spray in the dormant seasons, when there are no leaves on the trees. This article will give you more information: https://www.gardeningknowhow.com/edible/fruits/fegen/dormant-oil-information.htm