I decided after years to give my running rigging
a rinse! Not finding any serious guidance here is what I did:
I made up the lines, and the halyards with a shackle had a couple of old socks placed over them held with a rubble band or two. I then placed the lines in a mesh laundry
bag, tied the top in a knot
and tossed in into a large front loading
washing machine. I used warm water
and normal cycles and laundry
They came out of the machine only a bit damp - I suppose the water
was spun away... and I set them on the window sill to air dry.
Clean and softer - no doubt about that... and smell like laundry!
One rarely used spinnaker halyard
that had chafed through a portion of the core
(against the radar
mount?) managed to have about 6" of core
work its way out. I milked it back, but it's going to be cut and shortened. That was an old jib halyard
and was way long so the shackle will be re spliced to where the chafe was.
The made up lines got nicely fouled inside the mesh bag. But it was not terribly difficult to clean up the spaghetti.
It's not something I would do regularly, but at a cost of $10.50 for all the running rigging
on the boat, it's worth it every decade of so.