A clear thin liquid with a pleasantly dry orange citrus scent, it is steam distilled from citrus rinds.

This oil is very versatile, being safer to use and more effective than most commercial and industrial cleaners. At 5 - 15% of total product, it may be blended with surfactants for industrial-strength cleaners, or solubilized and added to water and vinegar bases for effective natural disinfectant surface cleaners for use in the home. It may also be used at full strength as a biodegradable solvent, without the negative impact that synthetic chemical solvents have on the user or to the environment.

Limonene is increasingly being used as a solvent for cleaning purposes, such as the removal of oil from machine parts, as it is produced from a renewable source (citrus oil, as a byproduct of orange juice manufacture). It also serves as a paint stripper when applied to painted wood and is also useful as a fragrant alternative to turpentine. Limonene is also used as a solvent in some model airplane glues. All-natural commercial air fresheners, with air propellants, containing limonene are used by philatelists to remove self-adhesive postage stamps from envelope paper.

As it is combustible, limonene has also been considered as a biofuel.

Limonene can be used to dissolve polystyrene, and is a more ecologically friendly substitute for acetone.

In preparing tissues for histology or histopathology, D-limonene is often used as a less toxic substitute for xylene when clearing dehydrated specimens. Clearing agents are liquids miscible with alcohols (such as ethanol or isopropanol) and with melted paraffin wax, in which specimens are embedded to facilitate cutting of thin sections for microscopy.

INCI: d-Limonene

Note: Not intended for therapeutic use, this is mostly used in green cleaning products and in fragrances.

Caution: Not intended for internal use only. Because of the appealing fruity scent, please do not blend with vanilla or other fruity scents in products that could be swallowed, as the Creamsickle® or Popsickle® scent of the product may mistake it as a food or beverage.

If ingested, do not induce vomiting; for small amounts, give milk, and seek medical attention.

Reference
wikipedia.org
National Institute of Health