The idea behind placing a clove of garlic in the toilet is relatively simple. Some people suggest dropping a peeled garlic clove into the toilet bowl overnight. During this time, the garlic slowly releases compounds that may help limit the growth of certain microorganisms in the water and on nearby surfaces. By morning, the toilet can simply be flushed.
Advocates of this method claim that it may help keep the toilet bowl fresher and reduce the buildup of unwanted microbes. While it is not meant to replace proper cleaning, some people see it as an extra step that supports bathroom hygiene using a natural ingredient that is already available in most kitchens.
Another reason this trick has gained popularity is its simplicity. Unlike specialized cleaning products, garlic is inexpensive and easy to use. There is no need for complicated preparation—just peel a clove and place it in the bowl before going to bed. In the morning, flush the toilet and continue with your usual routine.