Try Equine Mane & Tail Detangler. I used it on my horses tails that had not been done in quite a while and it worked perfectly. I thought I was going to have to cut out the matts but this product worked great. Start at the bottom and work up. Saturate a small area at a time, comb out and work your way up the tail. May take a few tail groomings to get the job done. You will be very happy you tried this product.