If I bought a lens advertised and priced as very good quality and received one with major cleaning marks I would return it immediately. However, I have bought a couple of lenses with major cleaning marks at a DEEP discount and do not see them in my photos, I am sure that at certain angles to the sun they would show up, and there are probably other problems that I don't notice. Still my ugly 105mm 1.8 with dings and cleaning marks is my favorite lens, I did get a great deal on it though.