D-Limonene is a colorless liquid aliphatic hydrocarbon classified as a cyclic monoterpene, and is the major component in the oil of citrus fruit peels. Biodegradable and non-toxic, it is designed to remove stubborn soils and stains. D-Limonene does not contain bleach, additives, or surfactants. Clear liquid appearance. Pleasant citrus aroma. Can be diluted 20:1 with water or used at full strength for industrial purposes.