My iVisor AG/Umbra screen protector isn't sticking anymore.

The iVisor AG/Umbra uses a washable and re-applicable adhesive that allows for long-term use. 

Before washing, cleanse your hands of any oils or moisturizers present, as they may get stuck to the adhesive.

Use a mild, non-moisturizing detergent (such as dishwashing liquid) and cold water to hand wash both sides of iVisor or Umbra. Gently, use your thumbs to brush away any dust or lint attached to the adhesive border. Rinse and gently shake to dry. Use the included microfiber cloth to wipe remaining water droplets on the screen protector, except on the adhesive portion. Let iVisor/Umbra air dry for 30 minutes by placing it on a dry paper towel with the adhesive border facing upward. Make sure no dust or lint particles stick to the adhesive border during drying and reapply. After a successful wash, iVisor/Umbra's adhesive border should restore to its original stickiness.

*Please note to avoid using soaps that contain oils and moisturizers.