Calypso spent many years at a slip in Stamford, CT within sight of the NYC skyline and a mile or so from I-95. Her lines had a nice pollution black tinge to them. Last year we had minimum commissioning time (and the boat was 250 miles away) so I left them alone. This year I have some time to get things really shipshape.
I read a number of articles about cleaning lines in the clothes washing machine and decided to take the plunge. There are some warnings around about doing damage to lines or the machine. I minimized this by using our front loader, tightly coiling the line and bagging it in a pillow case with knot tied in the end to keep the line in. For soap I used a normal dose of Tide HE and a few tablespoons of Oxyclean. The line escaped the pillow case a few times but this is not an issue in the front loader.
The results are fantastic.