I use the
washing machine trick on
dock lines every year (we have a slip so the
rope rode isn't fouled, but I double up the
dock lines when a blow is expected, and some times
parts will soak for a week or two in brackish water). I soak them good in dilute Mr. Clean and Tide
laundry detergent first (like 24 hrs), and brush them with a soft brush where they are a tad gooey; and make sure you bag them for the wash cycle or the cover can unravel at the splice a bit. I sue the delicate cycle, Tide, and Downy for the
washing machine. If you don't have a net bag big enough I have used a spare pillowcase but it wasn't as successful. If they do unravel a bit, then, well, it was time for a new one. Inspect them when dry and then decide.
If it was my
rode and I was going to leave her on the hook for a long time during the year, I would probably just replace it. But since ours is largely just used for lunch or an overnight in a protected cove here on the Chesapeake, I just give it a kiss every year and tell it to behave.