Bruce in Bangkok wrote in
:

When possible, use a
front loading washing machine;

Yep...brought home the lot and washed in my front loader Frigidaire with
the usual cheap detergent. Lines looked new and salt stiffness gone.

If you're squeemish about salt water in your $4000 super washer 5000, take
them to a laundromat without an attendant that has front loader commercial
machines.

DO REMEMBER TO TAKE ANY ANCHORS AND HEAVY TACKLE OFF THE LINES!