Next time, if you want to keep the product, you can always do an alcohol dip to dissolve oils. Vodka especially is what I would recommend as I am already adding it to my tank. Alcohols will dissolve any oily residue. You can then do a DI water rinse, and repeat as many times as you feel necessary to get all the oils off. Alcohol is also volatile and will evaporate in air.decided to return it. not worth the risk at this point.