Many toilet cleaners are designed to work fast, so you only need to leave them on for a matter of minutes. You may be surprised at how quickly these powerful cleaners get to work.
However, for toilets that are heavily stained, it may be necessary to leave the toilet cleaner for longer before flushing. To remove tough stains, leave the toilet bowl cleaner for an hour or even overnight. Make sure to keep the toilet lid shut to prevent hazardous fumes from spreading throughout the room.
Always check the instructions for use before leaving the toilet bowl cleaner overnight, as some products may not be suitable. Leaving certain cleaning products on for too long can risk damaging the surface or finish of the toilet bowl.