The iGCL-HC type non-marking contact method realizes 360° angle-free contact on a cleaning machine that is not covered and cleaned. It can be used for cleaning, smearing, smearing and other objects. It is not limited by space and position, and has no consumables. It is suitable for environmental protection applications. Scenes. Reliable, stable and durable tests that have withstood strict industry equipment tests, providing every customer with a safe and efficient cleaning inspection.