All of a sudden I've noticed that the toilet flapper isn't consistently returning to the closed position. It is fairly new, and I've made some adjustments to the chain, but it is still staying open at least once or twice a day.
What is the flapper catching on that it stays open?
Sometimes the chain has a tendency to kink or tangle after it gets corroded. Here the easiest thing to do is replace the entire flapper.
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.