You sleep on them every night, leaving behind sweat and dirt but how often should you wash your sheets and even more confusing, how should you wash them?

Institute of Home Science expert Mary Zeitler has worked in the Whirlpool Corporation laundry lab for over 20 years and knows the ins and outs of all things laundry.

She spoke with to give the dirty details on how and when to wash your sheets.

How Often You Should Wash Your Bedding – And The Right Way To Do It