Semi-Aqueous Emulsion Cleaners contain non-chlorinated solvents along with emulsifiers and inhibitors. Since they contain non-volatile materials, a rinse is essential. Many semi-aqueous cleaners are flammable and some have worker exposure limits. Most semi-aqueous cleaners emulsify soils, dispersing them throughout the liquid; as the cleaner is used, the entire bath becomes saturated. Many of the citrus based cleaners are considered semi-aqueous.