Pillowcases hold more bacteria than a toilet seat
Unwashed pillowcases for a week can host up to 3 million bacteria per square inch—17,000 times more than a toilet seat. To maintain hygiene and freshness, it's best to wash your bedsheets every 1 to 2 weeks. Pillowcases are among the dirtiest surfaces we come in contact with daily, often without even realizing it.