Edited to add: Months after making this post, I finally got a handle on the itch. I don’t believe it was sweet itch after all because he was still itchy come winter and full fly sheet with neck attachment in the fall.
I followed a treatment for psoroptic mange from the Merck Veterinary Manual: Ivermectin followed by another Ivermectin dose 14 days later. Diluted sulpher lime washes every 12 days. He stopped itching his mane after 2 washes, and the tail itching stopped after 3 washes.
I’ve been battling what I believe to be sweet itch with my gelding. I’ve ordered a variety of shampoos, sprays, and creams, some of which work better than others. I’m also working with the vet and have thus far tried daily zyrtec and dex but have not seen significant improvement with either. It is not an option to stall the horse at night at my boarding barn. I also believe it would be too hot for him to wear a fly sheet (100+ F).
I’m not convinced my current shampoo is relieving the itch enough and I don’t want to shell out on another big bottle of equine shampoo that may or may not work. Im also in a hurry to provide him a little relief before i leave town in a few days. What are your tried and true homemade rinses or shampoos with ingredients I can find at the grocery store/pharmacy? My sweet, suffering boy and I thank you!!