Cleaning up the grease stains on the plastic box requires preparation: toothpaste, toothbrush, dishcloth and water.

1. First squeeze a proper amount of toothpaste on the oil stain on the plastic box, as shown in the figure.

2. Then brush it with a toothbrush, so that you can brush off the oil stains on the plastic box.

3. Next, just wipe the plastic box with a rag, as shown in the figure below.

4. Finally, look at the oil stain on the plastic box and clean it, as shown below.