I live in southern Ontario, we have a lot of wild birds and squirrels around here. I have just noticed our chickens are picking under they’re wings and around vents. I believe it is mites, I have cleaned out coop and spread DE all around. I don’t want to use DE on they’re bodies. I was thinking of using garlic juice and water and spraying them but I’m concerned about the temperature. It is only 28farenhieght today. Is it to cold to spray them? Coop not heated. Any other suggestions.