What is the best way to clean the yellow 110 volt 30 amp power cord used in boats and campers?

Soft scrub with bleach.|||I use Spay 9 and a sponge, then I rinse it off. Looks like new!|||when i was younger, we used to use brake fluid, but i am sure that there are many modern day chemicals that will clean these hard to remove unsightly black stains form your yellow power cords. good luck!|||I use gasoline or diesel on a rag and run it along back and forth