I'm sorry to hear that you're still having problems with your cats. If your cat Clyde has IBD he'll most likely need to start taking prednisolone. My cat Starr has this and without it he'll have severe diarrhea and he'll just explode any where. I tried going to a holistic vet and even weaning him off of the pred but it just didn't work. He's now on 2.5mg every day but he'll still have a few accidents from time to time. His stools are usually firm now too so it's so much easier to clean this up if he does have an accident. He also takes 1/4 of a generic prozac pill every day and this helps to keep him calm because stress can also effect his IBD.

I know that you've tried several products on your chair aleady but have you tried Zero Odor? I bought some a few weeks ago and it works great. I bought it at Bed,Bath and Beyond. Starr had peed on one my bathroom rugs and even after it was washed it still smelled funny. I spayed Zero Odor on it and let it dry and now it smells great. I also used it on one of my cat beds because one of my cats threw up on it and it smelled like cat food. I hope that you'll be able to find something that works for you. Good luck.