scour

1. To clean, polish, or wash (something) by rubbing and scrubbing it vigorously, frequently with an abrasive or cleaning agent.
2. To remove debris and dirt (from something) by purging; to sweep along or off by a current of water.
3. To clear the digestive tract (of an animal) by administering medication that induces defecation or vomiting; to purge.
4. To (cause livestock to) suffer from diarrhoea or dysentery.
5. (obsolete) To cleanse (something) without rubbing.