Timotei is a shampoo brand owned by Unilever. The word Timotei comes from a wild grass called Timothy-grass. Timotei shampoo was launched in Sweden in the 1970s, and introduced to the world in the mid 1980s, but some countries only sold Timotei for a short period. The tagline was 'So mild you can wash your hair as often as you like'.
Timotei was featured in the anime "Lucky Star", episode 6. The character Konata jokingly makes a reference to a Timotei commercial, and is disappointed with her friends' confusion, contrary to Yui's reaction.