Ozone can be used to purify water by "inactivating" microorganisms. That may or may not help.
Febreze traps and binds hydrocarbon molecules which effectively reduces the perceived odor. It seems that your Febreze and the offending molecules ultimately end up laying whereever you sprayed it but is a reasonably economical and popular product.
Granulated activated carbon (GAC) can actually trap organic molecules. GAC has a phenomenal amount of surface area at a microscopic level which lends to its ability to trap molecules. It is used in municipal water treatment plants to remove trace amounts of volatile organic chemicals such as dry cleaning solvents from contaminated water supplies.
I looked into GAC when we first bought our Casita
as it has some vinyl odors. In my research I quickly learned that GAC is used to filter the ventilation of illegal grow rooms. They are fairly expensive (~$100+) setups, so I didn't pursue it.
There are also articles online concerning how to build a canister filter to be used with a fan. Here's some commercially marketed setups:
I have read (maybe on this forum) that placing a bag of charcoal in the trailer can serve the same purpose. That sort of makes sense to me, but I haven't looked into it deeply. Here's a page from a GAC supplier.
Activated Carbon & Charcoal Frequently Asked Questions | FAQ Page
I ultimately ended up just airing our trailer out every time the weather was nice, probably over 60 days, and that helped quite a bit.
Good luck Patricia.