Can not replace a doctor's visit

I bought this spray for my guinea pigs, in the Hoffnunf, their hair lice thus finally get rid of the constantly besieging :(
I have applied the spray 5 days ago, until I unnerved - have set aside - FOR LOVE OF MY ANIMALS.
My Schweinis have not let gladly, so to be sprayed from me. They even trembled and each of Schweinis has, knows what that means for stress for the animal. I had bought it because I had just read that it is intended to help in mild to moderate parasite infestation and all animals is not harmful.
I can say on this spray only the following:
- It does not smell or strictly by evil chemical mace
- It has slightly adhesive properties that are to be good, I think just to bond the respiratory tract of parasites
- Maybe it also has nursing properties for the animal, but could not and I did not want to try it more

Since my animals not it be great to be found sprayed with it and I could not perceive any great success, even after five days, I have as I said it adjusted so wet to spray my animals.
The lice were indeed to no longer be seen in my opinion in the places where I had sprayed my Tiee, but in other places. I really sprayed a lot and I had thought that the spray would distribute well.
The fur of animals looks slightly greasy and fässt after drying something slightly "hardened" to.

Well, long story short - I see no benefit in it, except that I have my animals expose enormous stress because I so at least every day would have to apply 1 x for 1-2 weeks.
I habs given up and then go back to the vet would prefer. Since then they have even stress and get a drop in the neck.
The spray was not reliable in my experience, it might not harmful for the animal.