From Sea to Summit:
"...the liners can be washed in a home washing machine using normal detergent (referred to as laundry ‘soap’). If you are using a top-loader washing machine, we would strongly suggest putting the liner inside a pillow case to prevent the impeller (the spiral plastic rotating column in the drum of the machine) possibly snagging the draw cord. A front-loader is much gentler on your gear, and this step is unnecessary. In either case, use the delicates or gentle cycle. Fabric softener will decrease the wicking performance of the fabric, and should be avoided. Do not dry the liner in a dryer; excessive heat can damage the fabric – air-drying is the way to go."
Date published: 2018-02-15