Another type of hydrocarbon cleaner is terpene. Terpene cleaners are plant derived hydrocarbon
with D-limonene from orange peels as the common ingredient. These cleaners have a very high
solvency and clean greases, oils, fluxes and adhesives very well. However, because of their low
volatility, an extra rinse and/or dry step is needed for the cleaning process. These cleaners are also
non-reactive with metals and most plastics. These cleaners are unique because they are
biodegradable and can be economically separated from soils and oils, unlike other hydrocarbon
cleaners. However, caution needs to be taken with the disposal of terpenes because of their high
biological and chemical oxygen demands.