Question: To rub scratches out of  a pair of sunglasses.
Options:
Apply a small amount of toothpaste on a soft cloth and then rub it into the sunglasses. Rinse with water.
Apply a small amount of toothpaste on a soft cloth and then rub it into the sunglasses. Rinse with soda.
Answer: Apply a small amount of toothpaste on a soft cloth and then rub it into the sunglasses. Rinse with water.