Bring back DDT!
Several years ago kids at school came down with head lice, so the teachers sent notes for everyone to get lice killing shampoo.
I had some real powerful DR So-and-So’s pine tar shampoo for dandruff and used it. It was so pine tary I had to use dish washing soap to get it out of my hair. It worked!
A few months later I was in a drug store, went down the VET isle, and saw this bottle. DR So-And-So’s Pine Tar Shampoo for DOG MANGE.
Same brand, same name, same amount of pine tar, same bottle.