washing the plastic parts of a very dirty kitchen exhaust fan in an aqueous solution of sodium hydroxide. a man works in

air allergy aqueous background bathroom blade blow blower building ceiling clean climate close conditioner conditioning details dirty duct dust electric equipment exhaust fan filter fixing gloves hands home house household hydroxide industrial installation installing kitchen man modern office parts plastic power propeller protective repair rinses sodium solution system technician technology thoroughly toilet vent ventilation ventilator vents very wall washing white worker works