Daz Doorstep Challenge (thing)
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The Daz Doorstep Challenge is a well-known part of British culture, often to be seen during commercial breaks. It basically involves a B-list celebrity turning up at the doorstep of a stereotypical housewife with children, asking if she'd like to swap her usual washing powder for Daz.
I suppose it's possible that they really did turn up randomly at people's houses, but then again I don't know anyone it's ever happened to. It's more likely that they employ actresses.