The self-adhesive sticker is a composite material that uses silicone protective paper as the base material, plus other materials of paper and film as the fabric. Among them, its back is coated with adhesive, which can be affixed anywhere as needed.
1. Tear off the sticker. Lift up a corner of the sticker, and blow it against the gap between the sticker and the passport with a hairdryer. The temperature should not be too high, so that the sticker may be peeled off completely, but it will leave a lot of glue marks.
2. Clean up glue marks. Use a cotton swab to take a small amount of cooking oil to cover the glue mark, wait for ten seconds for the cooking oil to soak the glue mark, then use the cotton swab to gently rub the glue mark (circular rubbing efficiency is high), and then wipe it off with a paper towel. Oil is fine, if there is any residue, you can repeat it again. There are more stickers on the back of the passport. Repeated wiping with alcohol and eraser is invalid when removing the glue marks. Instead, the more you wipe it, the dirtier it gets. Finally, it is removed with cooking oil. The right side is rubbed with cooking oil, which can be clearly contrasted with the left side. The advantages of this method are quick removal, easy access to materials, simple operation, and easier removal of metal and glass. The disadvantage is that there will be a faint smell of cooking oil on the passport, but you can wipe it twice more.