Great question — answering as the UphillTech team:
You obviously have a strong opponent here - designed to stick to the fabric for weeks according to the manufacturer. So pretend to "use" it: Wash repeatedly, as hot and "rough" as the fabric will allow, air out as much as possible. Sun and wind will help break down and carry away scents. In cases like these, I tend to leave the laundry outside even over night, e.g. wash in the morning, hang to dry outside, leave out over night (dew falling and drying again in the morning), repeat. Expect the process to last a few days and of course do not use detergent with (strong) scent . Kind of obvious, but you don't want to add scent / bind the existing scent.
Full answer by Stephie: https://lifehacks.stackexchange.com/a/11178 (CC BY-SA 3.0).
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