Strip old window tint cleanly using steam or heat, then remove leftover adhesive without scratches.
On rear windows, note the thin defroster heating lines — peeling carelessly can rip them. Cover nearby speakers and trim, and crack a window for ventilation if using ammonia.
Use a fabric steamer, a heat gun on low, or park in direct sun. Apply even heat to a corner until the film softens and the adhesive releases.
Lift a corner with a razor or fingernail, then pull the film back slowly and steadily, keeping heat on the bond line. Pulling slowly helps the film come off in one sheet instead of shredding.
Spray the glue residue with soapy water, an ammonia solution, or a citrus adhesive remover and let it sit a minute. Scrape gently with a plastic or new razor blade held nearly flat, keeping the glass wet so you don't scratch it.
Wipe away all remaining residue, then finish with glass cleaner and a microfiber cloth for a clear, streak-free window. Inspect in good light to catch any missed adhesive.