Hi! I am new here. I am trying to clean used canola cooking oil. I got the oil from a fast food place. The oil is very dark like red wine. There are no bits that I can see. So I tried to put in about 1:2 oil and water. Heated it up and mixed really well. The water separated very nicely. But it's all clear. The oil remained dark. Then I added salt. Same thing. Then I added Dawn. The oil separated in 3 layers. Could someone please tell me what I am doing wrong? Or its just not possible to wash oil? Thanks in advance.