I found that I was able to clean our Marinco Cable very effectively with "Goof Off" (see Welcome to the Goof Off Website
), available at Lowes, Home Depot et al. Once the cable was clean, I washed it down with a little warm soapy water and then, once it had dried, I coated it with 303 UV Protectant (see 303 Aerospace Protectant - UV protection from the sun for Rubber, Vinyl, Plastic and Neoprene
), carried by most marine hardware stores. It seems that if one re-coats the cable every few months or so with the 303, deterioration is minimized.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."