Are there any products to help deter mutual grooming?

You can use a product from jeffers, valley vet and probably other companies called bite back the generic is called sup-er red hot. It tastes hot like cinnamon and is used to deter horses from eating their bandages and wraps. Bitter apple works too. I do know that the farnam product no chew spray is not good to put in their hair as it is wicked sticky and will make a mess. I did find that once when I put original brown Listerine mouth wash on my horse's make to keep him from rubbing it, the other horses stopped grooming him and i ume it was because of the taste or smell. I do not know if it works, but it is worth a try. Good Luck.