scouring

Short definition from Wiktionary

Noun

1. 1
   The act of cleaning a surface by rubbing it with a brush, soap and water.
2. 2
   Diarrhea. (Now used only of livestock, though also sometimes used of humans into the 1600s.)
3. 3
   Erosion by water, especially in watercourses.

Verb

1. 1
   present participle and gerund of scour