I'm having some problems with the stainless cat in my Fireview. Temps are down and we're getting some light smoke out the stack with the cat engaged. I'm thinking that the cat has had some serious abuse this year. We have run the stove super hard in the couple cold snaps this winter and my stepson has been reloading for the first time. I'm thinking that he may not be as diligent as he could have been. I also ran into a vein of very unseasoned Red Oak in my stack a couple weeks ago. I called Woodstock today to order a new one. I told them what was happening and added that it was surely operator error. They suggested I do a cat wash before I replace it, Apparently the smaller passages of the stainless cats are more likely to clog and a bath in a heated vinegar and water mix can restore them. Has anybody else done this? I'm attaching the instructions that they sent to me.