Two products i know for removeing oils are cellulos thinners and panel whipe[alittle milder] these are both used in the auto paint industry and are standard products ,i used panel whipe on the bali blade,it is designed to remove ANY oils from a section of car bodywork before it is sprayed[even the oil from a finger print will react with the paint].Personaly id try soaking the blade in cellulos thinners for 24hrs with an ocasional skrub with an old toothbrush that should do the trick
