One might be cleansed with a strip (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
pore
(Other definitions for pore that I've seen before include "Minute passage in skin" , "Minute opening in the skin" , "Rope around the skin-opening" , "Sweat-gland opening" , "Sweat gland" .)