The most common method of removing a toilet bowl ring or stain is to use bleach. A common and powerful household cleaner, bleach is effective in removing stains from the toilet bowl. Simply pour a cup of bleach powder into your toilet bowl, and let it sit there for a few hours. Once the stains have disappeared, flush the toilet to wash the bleach away.
Vinegar is significantly less harsh than bleach, and it does not smell nearly as strong. Pour 3 cups of vinegar into the toilet bowl, and scrub the toilet bowl ring or stains with a brush until they have disappeared. A variation on this is to mix ? cup of baking soda with 1 cup of vinegar, and pour the mixture into the toilet bowl. Allow it to sit for a couple of minutes before scrubbing the bowl. Rinse the mixture away by flushing the toilet.
If you are tired of industrial strength cleaners or wish to use a more environmentally friendly alternative, consider some of the products that you have on hand around the house. By themselves, baking soda, lemon juice, white vinegar, isopropyl alcohol and borax are all excellent substitutions for conventional cleaning agents.