I found what I think is a faster method to clean the hard water deposits, lime scale, off the toilet seal. Mine was to the point of no longer sealing, yuck!
1. Empty water from bowl
2. Tear a paper towel into strips 2" wide. Push strips, torn side down, into the crack around the ball so that the torn edges get up close and personal with the seal.
3. Pour about 1/2 cup of white vinegar into the bowl.
4. Cover paper towels and vinegar with something that will keep vinegar from evaporating. I used a styrofoam bowl turned upside down and pressed down to form a good seal. I then weighted it down with the mostly full bottle of vinegar. You might not want to use this same bottle later for cooking
I did this last night just before bedtime and this morning it worked like new again.