Return to Daz Doorstep Challenge (thing)

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].

Funnily enough, the [woman] was always thrilled by the [results] and the sheets always turned out [whiter than white].

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 [actress]es.