Omega-6 fats, the linoleic acid specifically, can be found in vegetable oils and fried foods. But you also get them from really healthy foods like nuts and seeds. So it's a matter of adding something to the diet is more important here than necessarily getting rid of something.
Bill Harris, PhD is an internationally recognized expert on omega-3 fatty acids and fish oil. He has more than 300 publications relating to fatty acids, including omega-3s, in the medical literature.