How remove odor from interconnect?

I recently purchased a used pair of Cardas interconnects that have a strong aromatic odor. I suspect that the previous owner might have put something on the cables to cover a smell or possibly used one of those plug-in oil diffusers near the cables. I was refunded the purchase price and told to just keep the cables as he didn’t want them back. Anyway, I’ve tried washing them with isopropyl alcohol, soaking them in Dawn detergent overnight (twice), burying them in baking soda for a week, and tried to bake the smell out in a toaster oven at 180 degrees for several hours. I’m ready to just throw them out unless anyone here might have a suggestion.