Virgin orlon acrylic is a synthetic fiber that is, in itself, machine washable.

How do you clean Orlon?

How to Wash Filters. Rinse thoroughly with hot water. Do NOT use soaps, detergents or bleach because you don’t want to leave any residues which could potentially contaminate your syrup’s flavor. Never wring dry as this stresses the fabric.

When did they stop making Orlon?

DuPont discontinued Orlon fibers in 1990.