It WORKS!!! you can treat your girls too. Spray under/inside they're wings and undercarriage. Spray the legs too.
If your girls don't let you handle them, do it first thing early before you let them out. Or if its warm where you are at night, spray them then. They are always easier to handle at roosting time.
Then set them on the roost.
I do any procedures ect at roosting time. It's a lot less stressful on them because it's been so hot here in Florida.
Remember to spray your coop good with the spray. Make sure your girls are outside. Wear a mask, gloves and eye covering.