How to Remove It
You can easily remove these stains with a general-purpose cleaner that contains chlorine bleach. For toilet slime, add 1/4 cup of bleach to the tank, let it sit for 20 minutes, then flush several times to ensure all the bleach is cleared out. Don’t leave bleach in the tank for too long, as it can damage rubber valves and seals.
Also, be sure to avoid common cleaning myths that might not be as effective as you think!