Don't poison yourself with harmful substances. Just fill the toilet with this and it will shine like new

First, remove the water from the toilet by any means. Then fill it with one bottle of vinegar.

Take toilet paper, tear off pieces from the roll and dip in vinegar. Cover the inside of the entire toilet with paper. Then pour a pack of citric acid into the toilet. Cover with a lid and leave for eight nine hours. Then remove the paper and flush the toilet with water.