Timotei shampoo - made increasingly popular by its adverts featuring the Timotei girl - has been discontinued.
See also: Most complained-about adverts revealed
Bottles of the famous brand are now selling on eBay for ten times the original £1.50 price tag.
Even though the product will no longer be available in the UK, it can still be found in shops elsewhere in Europe.
The Timotei girl made a brief comeback in 2010 when English model Joanna Stubbs donned the white dress.
However the product is now set to disappear from British shelves for good, the Daily Record reports.
Timotei will be disappearing from shop shelves
Mock the Week and Outnumbered comedian Hugh Dennis once worked as a Unilever brand manager for Timotei.
Top brand analyst Roshida Khanom, associate director of market research firm Mintel, said: "Timotei has been disappearing off shelves, as well as our TV screens, which has made the brand less relevant over the years.
"As Timotei remains a strong brand in other European markets, suggesting that the brand continues to have a strong offering outside the UK, removing it from the UK seems like a strategic move by the company to streamline their product offering.
"It makes sense for a manufacturer to trim their product offerings on shelf and focus on making a few brands strong and stand out to the consumer rather than having a lot of noise on shelf."
Despite the sales pitch: "So mild, you can wash your hair as often as you like", it seems Timotei was deemed just not natural enough for Britain's organic obsessed consumers.
The hair product was once a UK market leader and the famous Timotei girl was regularly seen washing her long blonde locks under a waterfall
Expert Roshida added: "There's been a change in consumer behaviours and attitudes.
"Dry shampoo has really taken off in the last few years, and we know that women are washing their hair less frequently, which has impacted the haircare sector as a whole.
"But more specifically, we know that consumers are a lot more aware of what is and isn't good for their hair.
"Where a brand could previously put some botanicals in a formulation and reference 'natural' on pack and it was enough to give the impression a product was gentle and safer for hair, nowadays consumers are more scrupulous about what they believe to be natural/organic.
"While Timotei's brand positioning – free from parabens and containing organic ingredients – matches what consumers consider natural, the brand has seen little in marketing activity in the UK to bring it to the forefront of consumers' minds."
Timotei was once one of Britain's most iconic brands
Invented by Finnish firm Lintas Helsinki in the 70s, Timotei exploded on to the UK market in the 80s.
Swedish model Gia Bremberg was the original Timotei girl, seen washing her hair in a waterfall or brushing it in a meadow in commercials from 1983.
A Unilever spokeswoman said: "Due to changing consumer preferences in the UK and our decision to prioritise some of our other haircare brands, we decided to discontinue our distribution of Timotei here some time ago.
"We're still manufacturing the product and it is available in other European countries."
Timotei could be picked up for as little as £1.50 a bottle in some outlets before it vanished from the shelves. Vendors on eBay are now selling bottles for up to £11.65.