Article in English: Fill a bowl with 1 cup (240 mL) of water. Add the juice from half a lemon and 1 tbsp (8 g) of baking soda. Stir to create a soaking solution. Soak your nails for 15-20 minutes, then rinse with fresh water.  Lemon is a natural stain remover and can remove yellow stains. It's often used as a whitener! Baking soda is also a stain remover. Use a high-grit buffer, such as a 220 or greater. Lightly rub the buffer over the surface of the gel until the dingy layer is gone. You should see the original color of the gel return. This will protect the manicure and help prevent it from getting dingy again. Lightly brush a thin layer of top coat over your nails, then let it completely dry.  You can use your normal top coat over the gel polish. Continue to add a layer of topcoat every few days to keep your manicure looking fresh!

Summary in Indonesian:
Rendam kuku Anda dengan campuran air lemon dan soda kue untuk mencerahkan warnanya. Gosok permukaan gel kuku untuk mencerahkannya. Lapisi permukaan kuku dengan topcoat setelah memolesnya.