Scrubber (noun)

1. A person or device that scrubs or cleans something.
2. A type of device used in industrial processes to remove pollutants from gaseous emissions.

Origin:

Mid 19th century: from scrub + -er.

Examples:

1. She was employed as a scrubber in the hospital, cleaning the floors and walls.
2. The scrubber was used to remove sulfur dioxide from the flue gas before it was released into the atmosphere.
3. The scrubber was effective at removing harmful chemicals from the manufacturing process.
4. The scrubber used a chemical reaction to neutralize the pollutants.
5. The scrubber was an important component in the effort to reduce the factory's impact on the environment.