Used as a solvent or cleaning agent for industries that produce products that are sensitive to water. Hence, it makes sense to use a hydrophobic solvent. It also has a very low flash point and hence, evaporates rapidly.
This is useful in computer and electronics manufacturing industries that prefer immediate evaporation of cleaning agents for their work. During the design work for chips and circuit boards and integrated circuits, there needs to be a quick clean up if something is spilled and the work area needs to be devoid of any contaminants or obstructions as soon as possible; 99% IPA ensures that happens.