As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODD BURNING PLASTIC AND VINEGAR SMELL WITH IRRITATION TO THE EYES IN COCKPIT. CHECKED AVIONIC VENT FAN FILTER. FILTER DIRTY REPLACED FILTER, CHECKED BEHIND ALL C/B PANELS NO DEFECTS. OPENED CAPTAINS SLIDING WINDOW FOUND BOTTLE OF WINDSHIELD CLEANER IN WINDOW SILL. CHECKED WINDOW FOR DAMAGE NONE FOUND. SLIDING WINDOW OPERATES NORMALLY.