Etymology
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scrubbing (n.)

1680s, "rubbing with a hard brush," verbal noun from scrub (v.). Scrubbing-brush is from 1680s. Scrubbing-board "washboard, corrugated board on which clothes are scrubbed" is by 1889.

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Definitions of scrubbing

scrubbing (n.)
the act of cleaning a surface by rubbing it with a brush and soap and water;
Synonyms: scrub / scouring
From wordnet.princeton.edu