I am new to chickens and have 2 adorable silkies that I hand raised. I just love them so much, especially our snuggles at night watching a movie. Except now they have fleas!!! I am absolutely covered in flea bites. Ive found a few fleas on me after holding them so I know where they're coming from. So, I put some pour on drench on them today but I'm scared to snuggle them again incase it hasn't worked! Is there a fool proof way to make sure the fleas are gone without using myself as a test dummy? How often can I use the pour on drench?