MYSTERY STANK

This was what was found after I removed the kids car seats. Sick evidence of a good time.

Ever since the beginning of January - there's been a mystery smell in our car. It worsens when it's warm and fades in the cold. It's musty, dirty diaper, rotten milk, something rotting to death kind of smell. Nasty. In January I attempted to locate and destroy the odor - to no avail. It continued to loom about and it would surprise us with it's flare ups of stank. So last night I stripped the car to the core. I washed every square inch of that car - including the carseats, the actual car seats, floor mats, and every knook and cranny I could get my toothpick and cleaning toothbrush on. This morning I re installed the kids carseats and I hope that after a warm day today - I'll walk out into a non rotting car smell. Because really, aren't kids stinky enough? Who needs a rotting chicken nugget covered in rotten milk, covered in a rotting diaper to odorize your car?
Please let the mystery stank disappear.