The quality of clay bar has a significant impact on its ability to be reused. If the clay bar is of good quality and has not fallen to the ground, it can usually be used multiple times. However, if the quality of clay bar is poor, it may not be able to be used at once, and even the oxide layer or paint may not be removed. In addition, when using clay bar, attention should be paid to first spraying cleaning solution or car wash fluid to lubricate the surface, and then wiping with clay bar to ensure that the paint surface is moist and smooth. If the clay bar comes into contact with sand and wears out, or accidentally falls to the ground, it is no longer suitable for reuse. Therefore, in order to ensure the effectiveness of car washing and avoid damage to the vehicle, high-quality clay bar should be selected and properly stored.