A clay towel for car washing is a tool used in car detailing for removing contaminants from the surface of the car's paint. It is a fine-grade clay towel that helps in achieving a smooth and clean finish on the car's exterior. Clay towels are an alternative to traditional clay bars and are reusable. They can effectively remove embedded contaminants like dirt, grime, and other particles that regular washing may not remove. Clay towels come in various grades and sizes, offering different levels of abrasiveness for different detailing needs.