Search clean everywhere? (5)

I believe the answer is:

scour

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This clue might be a double definition.

'search' is the first definition.
(scouring is a kind of searching)

'clean everywhere?' is the second definition.
'scour' can be an answer for 'clean' (I've seen this before). I'm not certain of the 'everywhere?' bit.

Can you help me to learn more?

(Other definitions for scour that I've seen before include "Turn upside down" , "purge" , "Scrub hard" , "Clear out" , "Attack with brush" .)

I've seen this clue in the Evening Standard.

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