Embedded automobile odors are in the fabric, carpet, and headliner. Vacuum surfaces first. To use Auto Odor Killer with your preferred size, soak carpet and fabric and let dry. Use a saturated cloth to wipe down surfaces & headliner one section at a time, and allow to dry. Wipe off any white residue with a clean, damp cloth. Re-apply as needed until the smell is gone. Visit our instructions and FAQ pages for more information.