That depends on the Oranges.
While organic Oranges should not be chemically contaminated, conventionally cropped Oranges can hold a wide variety of chemicals including:
thiabendazole
imazalil 
Citrus Red 2
However according to the CSE, washing them with 2% of salt water will remove most of the contact pesticide residues that normally appear on the surface of the vegetables and fruits.
Almost 75 to 80 percent of pesticide residues are removed by cold water washing.
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