Could shampoo be a thing of the past? Millions of us spend time and money on it, but is it necessary? Fewer people are using shampoo because they are changing their hair-washing habits. A study by a consumer analyst company said: "People are working from home…and fewer people are smoking, so [they] are using less shampoo less frequently." A hair website said shampooing regularly may be why hair gets so greasy. It makes the scalp dry, so the head produces more oil, which you have to shampoo again to remove. Shampooing less often can mean less oil.

Many people say shampoo is good for the hair. A top hairdresser in the UK said there is no benefit to not washing your hair. He said shampoo is gentle on your head and it helps the hair to look glossy. He added that the hair's oil may help it look shiny, but it doesn't clean it. A London hair loss clinic said: "Rinsing your hair is not going to be very effective after certain activities that make the scalp sweaty, such as exercising or using a sauna." It added: "Rinsing will also not remove bacteria or clean the [extra] oil from your scalp if you have greasy hair."