Getting back to the original post, I don't think you need Technu or Zanfel to wash your hammock and straps. Poison ivy (not poisonous, but many people are allergic to it) has the unique property of binding to human skin molecularly. Therefore, it needs the highly specialized solvents in Technu and Zanfel to break that bond.
However, it washes out of fabric as easily as any other plant oil. Just wash your hammock and straps (if you think they've been in contact with poison ivy) in a bucket with a fairly strong detergent mixture. STIR WITH A STICK! Let soak for a while, stir again and RINSE THOROUGHLY with a hose on the ground. Once the water runs clear, ring everything out so it's not dripping and hang to dry. Good luck!
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