Try this simple solution if your toilet has lost some flushing power
Has your toilet lost some of its flushing power? Using a small mirror, you can check the series of holes that sit under the rim of the bowl. These tiny holes, known as flush passages, shoot water into the bowl each time the toilet is flushed, but sometimes they become plugged up with mineral deposits or grime.
To enhance flushing power, poke each hole clean with a length of wire clothes hanger. After cleaning all the passages, flush the toilet to remove loosened deposits. If necessary, repeat the process.