To provide a brush piece of a wash brush for a car washer, a wash brush for a car washer, and a car washer, which oxidize lipophilic organic dirt adhering to members of the brush piece of a wash brush for a car washer, the wash brush for a car washer, and the car washer, and decompose the dirt into hydrophilic substances by applying photocatalytic action to the members of the brush piece of a wash brush for a car washer, the wash brush for a car washer, and the car-washing machine, give an antifouling property and an antimicrobial property by rinsing the hydrophilic substances with washing water or the like for self-cleaning, and maintain and improve a high washing property over a long period of time without attaching dirt to a washed surface again.

In the brush piece of a wash brush for a car washer, which is used for a car washer for washing dirt or the like attached to the washed surface of the outer surface of an automobile or a vehicle, the brush piece has at least one or more kinds of properties of photocatalytic organic substance degradability, a hydrophilicity, self-cleaning property, an antifouling property, and an antibiotic property.

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