Daz is the name of a popular laundry detergent on the market in the United Kingdom and Ireland. It is manufactured by Procter & Gamble and is lower priced than P&G’s main brand, Ariel. Aggressively marketed, it is associated in popular culture with the “Daz Doorstep Challenge” series of commercials, which saw various ‘hosts’ including Danny Baker, Shane Richie and Michael Barrymore surprising house occupiers at the door and asking them to put Daz to the test against a rival detergent. The advert was famously spoofed by Dom Joly in the British sketch series Trigger Happy TV where Dom would knock on doors presenting the ‘zap mega’ challenge. He then ran from the scene with the crew in tow, arms akimbo, legs flailing while the occupier went to retrieve a white garment. The occupier then returned to the door looking bemused. The advert was also spoofed in a John Smith’s advertising campaign featuring Peter Kay. Recent TV commercials are set in an obviously fictitious “Cleaner Close”soap opera.

Info gleaned from Wikipedia