I had that happen a few times as well and the funk was killing me when I opened my toolbox. I finally would just stretch it from the ball of one truck to the ball of another (so there was sag but it wasn't touching the ground if that makes sense? Then I would use my garden hose and wash it, then rotate it and wash it again then I would let it dry hanging in the garage looped on the end of the garage door tracks. I didn't want to keep it outside in the nasty FL sun to be broken down by UV light.
Note my is like 2" by 30' so not sure if the extra thickness hurt me more than you?
Well I'm stubborn so I stuck it in the washing machine. But I put it inside an old hooded sweatshirt first. Balanced the load with some Tshirts and it came out great.
I typically soak them in warm water for a looong time when they are really dirty, moving them around with my hands for a little "washing machine" action. Replace the water several times if they are really dirty. I've replaced dirty water over half a dozen times before. You can add some light detergent such as Woolite but most of the time some warm water serves me well. While these lines are tough and some heavier soap and even some direct water action done correctly wouldn't hurt I haven't needed to go that far before. Once clean lay them out in the sun to dry - rotating and flipping several times because the line is thick and needs help drying.
For ropes I usually use a clean garbage can and some simple green. Agitate a little, rinse real well.
I don't recommend using harsh cleaners like degreasers. Chemicals can damage rope fibers depending on the manufacture of the rope.
Not familiar with simple green, but I've been using Dawn Dish Soap with out I'll effect for at least 10 years.
I don't recommend using harsh cleaners like degreasers. Chemicals can damage rope fibers depending on the manufacture of the rope.