Clean and sanitize the the rest of the room and floor, if applicable, before you clean the drain, recommends Iowa State University.
Some utility rooms, bathrooms and basements have a floor drain. These drains can become a haven for bacteria, especially If you had a flood or sewage backup, or perhaps an animal had an accident and you flushed the contaminated materials down the drain. Fortunately, with the help of just a little bit of bleach, you can disinfect your drain without much effort.
Pour approximately 1 cup of bleach directly down the floor drain. Let it sit for 10 or 15 minutes.
Fill a bucket with hot water and pour it down the drain slowly to flush the bleach and complete the cleaning process.
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