Depending on just how bad Ozium after a good Ozone generator whack (Comercial unit) will kill it. Be advised tho Ozone breaks down rubber seals in high concentrations that a commercial unit can deliver. I used a Rainbow unit
#ad
Used for carpet and upholstery restoration / hotel rooms, (Smaller than pictured it was a 40,000 Cuft unit) and in my chevy I ran it for 15 minutes which was waaaayyyyyy overkill and it wiped out the odor.
OZONE generators are the ultimate in oder removal, I used to sell them to Limo companies to get rid of oders after someone pukes in the back.
But before you use a Ozone generator learn about the health risk of ozone in high doses, so you are sure not to expose yourself to this.