No need to use expensive Tecnu to wash your clothes. Any detergent with hot water will wash out the uroshiol just as well. Tecnu is labeled as a "skin cleanser". I just use my normal laundry soap on my clothing. Twice for good measure.

I'd rather risk a secondary exposure from clothing than direct exposure on my skin. Check any website on poison oak/ivy prevention and you will find the phrase "protective clothing" quite often.

I'm hard pressed to believe that anything you apply to your bare skin provides protection superior to clothing.

But whatever works for you is what counts.

Last winter I had a bad case. Picked it up from my dog in Montana de Oro State Park. I knew it was there and took precautions but didn't think about my low slung Dachshund walking off trail. Yes he was on a leash. It was a lesson learned.