Smelly Cabin - Ideas?

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I've got a smelly cabin problem. Not sure where to look. The basics - 2016 Tundra ltd. Stock interior with full weathertech floor mats. Since moving from Utah to Alaska it's started smelling terrible in the mornings. I'm not even totally sure how to describe it. Basically like when you go into an apartment building and you smell other people's cooking on each floor and you go: What are they cooking? That, plus crap. And mildew smell.

TBH it smells like a wet diaper that has sat for a few months and is now getting rotten or something along those lines. Not the same as the AC vent mildew issue that I've had in the past in my RX350.

It's strong when I get into the truck if I leave the windows up in the garage. But as soon as the doors are open for a bit it dissipates pretty quickly. I get down under the seats and smell around and I can't find anything. I've smelled the carpets, pulled the mats, checked under seats and in all the compartments. Nothing. And it doesn't seem to be coming from the HVAC. I put a new filter in and when it comes on the smell from the HVAC is clean air. I even tried some Ozium through the hvac to see if that would help. But now it's just chemically air freshener smell plus s*** in the morning. Didn't help the original smell at all.

Any ideas of other things to look at? Is there somewhere I'm not thinking of that a rodent could go die in the headliner from the sunroof area or something weird like that. I can't seem to even follow the scent because as soon as i open the doors to start sniffing around it goes away and I can't pinpoint it.

TIA


Edit: solved. Tonight I pulled everything out of the truck. Looked everywhere. Even looked in the roof between the headliner and the metal with a scope. It I finally stripped the car seats apart and there it was. Rotten milky substance in a compartment inside the kids seat. I didn't even know that area existed. I do now. Lol.

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Very nasty. It was a tricky one because the smell was putrid, but faint. Even when I'd sniff around the seat it wasn't strong enough to identify locally as coming from the seat. But left overnight the cab was smelly by morning. It wasn't until I stripped the seat covers off that it was obvious that the small was in the seat base.

I'm still not sure why that little storage area exists. It must have had some reason to store something inside there. I don't think any of them came with something hidden inside. My solution is to drill some drain holes so if anything goes in it'll spill out the bottom. It'll still be messy, but at least I'll know about it and clean it up.
 
If you still have some residual smells left over, look for an ozone air freshener spray, it works wonders. It was an industrial product we bought through a cleaning supply company at work, and it did a real good job removing that dead rodent, mouse piss smell we had in some of our buildings at work.
 
Fascinating. I almost start gagging when I look at that pic.

Years ago I bought a used car that ended up stinking like hell after the dealer's coverup perfume/scent wore off. I used a combination of Ozium and Zero Odor to knock it out.

Air Care – Ozium<sup>®</sup> - http://aircare.niteoproducts.com/ozium-2/
 
I tried Ozium along the way. Probably works well for the right kind of smells. Fortunately the truck smells good again after cleaning out that seat so it might have done it's job on the interior and already taken care of lingering smell, or I don't need it. Either way - I'm good now!
 

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