... cabinets, cooking utensils,Elevator or hotel decoration,indoor pipelines,water heaters,boilers and bathtubs in Class 1 and 2), ... Oil refinery equipment, oil burner and heater parts5.Appliances: Hot water tanks, residential furnaces, escalator, doors6.Power generation:Heat Exchanger tubing10. ... surface scratches(3) Use soap, weak detergent or warm water to remove surface dust, dirt(4) In addition to ...