Fairy is a brand of washing-up liquid produced by Procter & Gamble at their West Thurrock factory (The London Plant), England. Fairy liquid is traditionally green, prompting the well-known advertising jingle “Now hands that do dishes can feel soft as your face, with mild green Fairy Liquid”.
As of 2008, Fairy is sold in most parts of Europe, although regional names vary. Fairy liquid is available in a variety of colour and scent combinations. The iconic white bottle with red cap was replaced with PET bottles.
In the UK, Fairy Liquid has become a genericized trademark for washing up liquid.
Outside the UK, the products are a part of the Dreft brand.
Info gleaned from Wikipedia
1979 Dreft Washing Powder commercial.
Dreft is a popular laundry detergent in the United States, Canada, United Kingdom, the Netherlands and other markets. First produced by Procter & Gamble in 1933, it was one of the earliest synthetic detergents. Upon its inception, Dreft was touted as a significant improvement over the soap suds of the day, but it proved best at treating only lightly soiled clothes and not heavy loads. As Dreft does not leave a lime scum deposit nor does it contain harsh chemicals such as bleach, it is suitable for fine washables such as silk or wool as well as flame resistant fabrics. The Fairy brand of washing-up liquid is also sold under the name Dreft in some countries.