- Lower the window fully and clean the window channel with a dry cloth.
- Hold the deflector against the door to check it's the right one for that door.
- Gently bow the deflector and slide the front end into the top of the window channel.
- Ease the rear end into the channel so the whole deflector sits evenly along the top.
- Raise the window slowly. If it stops or drops back (anti-pinch), push the deflector further into the channel and try again.
- Leave the window fully closed for 24–72 hours so the deflector settles in place.
Car with one-touch or automatic windows? You may need to reset the window after fitting – check your car's handbook.