The term 'clean vigorously' can be interpreted in two ways: scrubbing and scouring. Scrubbing is the act of using a brush or other abrasive material to remove dirt, grime, and other substances from a surface. Scouring is the act of using a harsh chemical or abrasive material to remove dirt, grime, and other substances from a surface. Both methods are used to clean surfaces and objects, but they have different levels of intensity. Scrubbing is usually done with a brush or cloth, while scouring is usually done with a harsher chemical or abrasive material. Both methods are effective at removing dirt and grime, but scouring is more intense and can cause damage to surfaces if not done properly.