Did you use something like Febreeze or something made to get rid of pet stains and odor? I use pet stain remover for potty accidents (from all of my kids, including those with 2 legs and those with 4), and it works fine. Most recently my younger DS had a saggy diaper on (saggy from sleep, not saggy from being wet) and ALL of his potty went on the chair. It wasn't just a dribble. It soaked the chair. I thought the chair would be ruined, but it came right out. The pet stain remover I have right now is called Simple Solution, but I've used many brands and they've all worked just fine.