Olefin is a synthetic (manufactured) material. It's also known as polypropylene, a type of thermoplastic used to make a wide range of household products, medical devices and more. Because it's ...

or olefin/polypropylene (a synthetic fiber commonly used for carpets). Jute, wool, and silk rugs are not machine washable. But even with rugs that can be safely machine washed, tossing them in the ...