Water: salt water, chlorinated drinking water,
etc.
Acids: caustics, welding and degreasing materials, acids contained
inside crate wood and electroplating baths stored near the packaging
department, etc.
Dust: and dirt attract dampness and bind corrosive
substances
Other: hardened oils and greases bind dampness,
sweat from hands contains chlorides, sulphates and phosphates such
as lactic, uric and fatty acids