You can't wash the odor away - it's IN the material, not ON the material.I read through this thread before I bought my 2020 RTLE in January, and assumed that the smell would be like any other new car smell. Boy, was I wrong! This trunk smell is atrocious and refuses to dissipate. I washed out the trunk with soap & hot water in the first week, and I've left the trunk open in my garage nearly every day for three entire months with odor absorbing products in there the entire time. It smells as bad today as it did on day one. I wouldn't mind if I never planned to use the trunk, but the smell seems to transfer to stuff that I've carried in there, mostly items with fabric (like clothing), but including some groceries. Hopefully, it's not permanent, or the trunk will be much less useful than I had hoped.
Leaving the trunk open will only temporarily dilute the odor - as soon as you close it it will become concentrated again. This is because the odor is constantly being emitted from the material.
Odor-absorbing substances like charcoal won't "suck out" the odor any faster, although they may dilute the concentration while the materials emits its odor.
Sunlight (UV) won't help because, again, the odor is IN, not ON, the material. Light doesn't get inside the material.
Heat won't help - the material was already FAR hotter while is was being molded than it will ever be on the hottest, sunny day.
"Air fresheners" won't remove the odor - they'll just cover it up with additional chemicals that smell better to some people.
What WILL work with 100% success and requires no effort and costs nothing? PATIENCE. The smell (which doesn't bother me at all) WILL fade over several months on its own. Alternatively, you could paint the surface with a sealer, but good luck finding a sealer that emits no odor of its own.
I give you my personal guarantee that cigarettes, alcohol, junk food, medication, cosmetics, perfumes, and cleaning products are doing FAR more damage to your body than a few seconds of exposure to the Ridgeline's trunk a few times a week.