To provide a method of use of a bamboo vinegar which is effective for hay fever and may be used in a toilet lotion.

Hay fever is prevented by using a toilet lotion composed of a weakly acidic astringent in which a few drops of bamboo vinegar, edible collagen obtained from pigskin, edible silk protein containing amino acids constituting the base for the proteins contained in high quality silk and sodium bicarbonate are added. The toilet lotion is more effective than ordinary one in which only bamboo vinegar is added in natural water. In an embodiment, 1/3 teaspoon of edible collagen, 1/3 teaspoon of edible silk protein, 1/6 teaspoon of sodium bicarbonate used for a stomach medicine and 9 drops of a high quality bamboo vinegar are added in 150 cc of water running out from the tap of an alkaline ionized apparatus, the mixture is agitated to obtain the toilet lotion and it is applied firmly for the face, neck, hands and feet.