It's probably the washer fluid. If it have you squirted the windshield? You may have a leak in the tubing to the rear window/wiper. Try squirting front and rear and see if the smell increases.
sounds like maybe some body spilled some cleaning solution while detailing ur car for delivery.. the only other thing I can think of is the cabin filter may need to be changed..the previous owner may have been a smoker..
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