Pretty sure it's a window film - something like - https://www.amazon.com/Coavas-Non-Adhesive-Stickers-Removable-Bathroom/dp/B07VFZTKK4 https://www.amazon.com/Co

Pretty sure it's a window film - something like - https://www.amazon.com/Coavas-Non-Adhesive-Stickers-Removable-Bathroom/dp/B07VFZTKK4 https://www.amazon.com/Coavas-Non-Adhesive-Stickers-Removabl...