I can confirm the Meguires Odor Bomb works. The "crayon" smell in mine was pretty potent. After driving it I could smell it on my clothes after getting out of the car. I'd have to roll the windows down ever so often driving down the road
It would smell up the entire garage!
No bueno.

I tried many things first, changing filters, spraying cleaning solution up into the evaporator coil drain, Spraying AC cleaner in the vents, spraying Odorban onto the carpet which worked for a few days. Ozium in the air, bags of activated charcoal underneath the seats etc. But the odor monster would always come back.

So after determining the odor was emanating from the carpet and permeating into the AC and everything else I went and bought a Hoover carpet cleaner from Home Depot.
I then pulled the seats out. (A 12 point 10mm socket works great BTW.) After thoroughly cleaning the carpet using the solution that came with the Hoover, (3 oz per gallon of hot water) I put the seats back in.

The next day I used the MOB after first removing the cabin filter, pulling up the floor mats, opening up the glove box and console, moving and tilting the seats forward to expose the back panel. Probably should have pulled the visors down too.

I can now say that the monster is nowhere to be found a week later.

Crossfire's aren't the only cars that have this problem. MB, BMW, VW all have this issue apparently.