Why do restaurants and hotels often put ice in their toilets?

In addition, pouring ice into the toilet creates a low temperature environment that helps prevent the growth of bacteria and prevents waste from sticking to the walls of the urinal, making cleaning easier.

The final benefit of ice is to help unclog the toilet. When flushing ice cubes down the drain, it creates strong pressure to push light waste such as toilet paper down, helping to effectively unclog the toilet.