In this case, manual cleaning using a wire brush or scraper is not efficient.而通过用钢丝刷、刮刀手动除去这些杂质的效果并不理想。
Remove corrosive salts, chalk marks, soil or other contaminants and foreign matter by brushing the steel with a stiff fi用硬纤维、钢丝刷或二者之一擦拭钢材表面除去附着的锈盐、粉斑、油迹及其他污染物。