wash room environment purification can reach to million grade purification. Make the cleaning treatment with washing fluid, HF and HNO3. Water treatment up 10mΩ or more; include the cleaning requirement of thousand grade purification final inner packing up to 18 mΩ or more. Have electronic drying box and all kinds of product classification cleaning method. Ensure the products packing in the pre-processing and post-processing are free from pollution of environmental and various impurities.