Toilet cleaner

In recent times, automatic toilet bowl cleaners that clip onto the rim of the toilet and clean with every flush have also become prevalent.

In-tank toilet cleaning tablets are also available.

Such tablets are placed in a toilet's tank, where they very slowly dissolve and thus add cleaners into the toilet water for a period of weeks.

Toilet cleaners tend to be toxic, as they contain disinfectants which can cause skin irritations.

[1] "Heavy duty" formulations often include hydrochloric acid (HCl) in varying amounts, necessitating care in handling and storage, as well as adequate ventilation while in use.