Search; clean (5)
I believe the answer is:
scour
I believe this clue is a double definition.
'search' is the first definition.
(I know that scour is a more specific form of the action search)
'clean' is the second definition.
(I've seen this before)
(Other definitions for scour that I've seen before include "scrub and scrape" , "Comb" , "Attack with brush" , "Rub hard or search thoroughly" , "Hunt through" .)