When my wife and I went through TNR classes we were given a goody bag.
This included flea drops "GENTLE TOUCH" by Farnam.
We tried it on several of our CREW. All but 1 ended up with a BRIGHT RED streak down their backs and started to lose hair. Timmy was the most effected and haS a bald spot about 9 inches long and 4 inches wide.
The other thing is it DID NOT seem to have any effect on the fleas.
I CANNOT RECOMMEND THIS PRODUCT AND I WOULD SUGGEST THAT PEOPLE DON’T USE IT.