Re: Cleaning a 50’s OMC tank Home › Forum › Ask A Member › Cleaning a 50’s OMC tank › Re: Cleaning a 50’s OMC tank 1957evinrudeUS Member - 2 YearsReplies: 253Topics: 53 March 17, 2018 at 10:22 pm #72612 I found this and there are other videos if you decide to try. https://www.youtube.com/watch?v=5tgugq78V7Y