Ol'Trick

"Baking Soda" .... take the ropes put them in a bucket, add (clean) water, soap and Baking Soda ... let soak for several days ... change water/soap/baking soda

Baking Soda removes the salts that build up in the rope/line that make it stiff, and acts to "soften/condition" the water. Washing machines can "beat" the rope/line up.

And moms/girlfriends/wives do not take kindly to you putting old dirty ropes in their clean washing machine ... I would advise doing that when they are away!!!! The word conniption comes to my mind .... (Personal Experience)

Harry