Maintain solution between 135 and 155 F. Drain thoroughly. Rinse equipment completely with modest amount of cold water. This will limit mineral or milkstone buildup and bacterial growth between milkings. Never mix acid cleaners with chemicals that contain chlorine. Drain the system completely.
Residual water can allow bacterial growth to occur before the next milking.
Sanitize immediately before the next milking. This will destroy bacteria that may have grown on equipment surfaces between milkings. Newer, more sensitive milk quality tests can readily show the difference between equipment sanitized just before milking and equipment not sanitized. Cleaning other parts of the system Air can carry bacteria into milk from other equipment surfaces. Cleaning air lines and the sanitary or moisture trap every 2 weeks will help keep bacteria counts low.