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The citrus smell is actually made by extracting the oil from orange and lemon peels. There is a company in Florida that buys the peels by the tractor trailer load from Sunkist and other juice producers. The extracted oil sells for about $20.00 a pint and is purchased in tank truck loads (@9000 gallons) by companies like ZEP. It can be used as a cleaner by itself but it is so expensive it is used as a component in other cleaners and soaps.