Use a clean microfiber cloth so you don’t introduce debris into the scratch. Dampen the cloth with lukewarm water and wash the glass as you normally would. You only need a spoonful or less of each ingredient. It’s best to place them in a bowl so you can mix them with a spoon to remove large clumps of baking soda. When mixed, you’ll have a pudding-like paste. Again, use a fresh cloth. It helps to wrap the cloth around your finger and press the cloth into the paste. This way, you’ll pick up a small amount of the paste. Place the paste on the glass and buff out the scratch by moving the cloth in a circular motion. Do this for 30 seconds maximum, watching for any sign of the scratch disappearing. Rinse the glass or apply a fresh cloth. Dampen the cloth in lukewarm water and pass it over the scratched area, making sure all the baking soda paste is removed.

How would you rephrase that briefly using Vietnamese?
Lau sạch kính. Pha trộn nước và muối nở với tỷ lệ bằng nhau. Cho hỗn hợp lên mảnh vải. Chà hỗn hợp bột lên kính theo chuyển động tròn. Rửa sạch kính.