Organic solvents are of many different types and origin but have in common a hydrocarbon nature. Organic solvents depend largely on their ability to dissolve organic contaminants on a molecular level and this ability is therefore strongly dependant on the molecular structure of the solvent. They are good at dissolving and cleaning of organic contaminants and films, such as oil, greases or waxes and useful in both spraying operations, wipe-cleaning or cold immersion processes and often have the advantage of fast drying leaving no residue. Their disadvantages may be low flame points – resulting in fire and explosion risks, health hazards ranging from mild irritation to severe toxicity or carcinogenic properties. Some may be ozone depleting substances and/or be very toxic to aquatic environment. This can result in their use being highly regulated, requiring strict containment and emission and disposal control.