With which to clean up Coronation Street? (4)

I believe the answer is:

soap

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'coronation street?' is the definition.
(Coronation Street is a soap opera)

I can't explain the rest of the clue.

(Other definitions for soap that I've seen before include "TV programme; cleanser" , "Cleaner - TV programme" , ". . . . opera, sentimentalised radio or tv series" , "If soft, it's used to flatter" , "Bath tablet" .)

I've seen this clue in the Evening Standard.

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