Clean with toothpaste at first. It's clean this way. And it won't leave a stain. Then when it's dried, use the cleaning fluid attached with the laptop and spray it on the unadhesive side. And then wipe it up with clean cloth and dry it off. That's all.
2; 3: Solution: 1. Get a basin of clean water. 2. Gently rub and wash the keyboard protective film in the water without using any detergent. 3. Put it somewhere shady, cool and ventilative (avoid direct sunlight) to dry off. And when it's done, it's adhesive again.
You can wash it. When it's clean, it's adhesive again.
