US television sitcom that featured the Tate and Campbell families (4)

I believe the answer is:

soap

(Other definitions for soap that I've seen before include "Cleaning substance - melodramatic TV or radio series" , "Day-to-day TV series" , "Cleaner - long-running TV show" , "TV series of cleansing sort" , "Washing substance" .)

I've seen this clue in The Mirror.

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