Missed this spot, just found it was removable. Wet dog smell. If someone knows any other techniques pls leave comment. Used rocco&roxie stain and odor eliminator w. enzyme ,car guy- fabric cleaner. 2 bags of zeolite rocks, already did vinegar and baking soda techniques worked ok but the smell is baked in to the seat. Zeolite rocks may be helping but hard to tell because this is my 3rd time cleaning the seats. Currently the car doesn't smell as bad but still have lingering smell.