Article in English: Open a small package of lemon Kool-aid (available for $0.25 USD at many grocery stores). Sprinkle the Kool-aid powder all over your toilet bowl, making sure it covers the rings. Once you have successfully applied the Kool-aid powder, set a timer for 1 hour. Make sure that no one in your household uses the toilet during this time. crub your toilet. Using a toilet brush, scrub the lemon Kool-aid into your toilet bowl. Work in a circular motion, paying particular attention to the rings. When you are done, flush the toilet.

Summary in Chinese:
将柠檬味冲饮粉倒在马桶里。 等待一个小时。 刷马桶。