It comes from the machine shop. This company doesn't have a friggin clue about welding and why it's bad to leave parts covered in heavy, highly sulfured oil. I've literally been telling them about this issue for over a year.   

 Ah ok that’s lame sauce 

 it has to affect their bottomline b4 they care ime 

 It does. Hugely. They don't realize how much money they are wasting on every job that comes into the shop. I've told them. It's not my problem at this point.  

 machine shops need oil for cutting/friction