Mediterranean breeds are great for hot weather (Leghorns as an example). Quite a few high production layers are less heavily feathered too.
You CAN wash chickens with mild unscented wash meant for animals. But, not the first choice - a nice dry dust bath is really what a chicken wants (peat moss, sawdust, sand, ash, are all good examples of things for a dust bath. NOT diatomaceous earth (DE) bc terrible to breathe in, but if you feel you must add DE, don’t make it a big % of mix). We wash chickens for show, and we also blow dry them (which they actually like) bc you need to dry their under feathers or they might get too cold (not sure about LA, but it’s too cold here and they will shiver even in July if too wet for too long). So, you can certainly wash just their legs and feet if needed.
Keeping cool: shade of course. Cool water to drink. Some use shallow tray or similar and place a block of ice so it melts over a few hours and chickens can walk on it, and through the cold water.
You CAN wash chickens with mild unscented wash meant for animals. But, not the first choice - a nice dry dust bath is really what a chicken wants (peat moss, sawdust, sand, ash, are all good examples of things for a dust bath. NOT diatomaceous earth (DE) bc terrible to breathe in, but if you feel you must add DE, don’t make it a big % of mix). We wash chickens for show, and we also blow dry them (which they actually like) bc you need to dry their under feathers or they might get too cold (not sure about LA, but it’s too cold here and they will shiver even in July if too wet for too long). So, you can certainly wash just their legs and feet if needed.
Keeping cool: shade of course. Cool water to drink. Some use shallow tray or similar and place a block of ice so it melts over a few hours and chickens can walk on it, and through the cold water.