Learn a lesson on bad gas

I worked at John deere dealership for 6 years and seen this on more than one piece of equipment. We usually were able to flush out all the old fuel put new fuel in with seafoam. then get it warmed up good at idle and then seafoam it through the carb and shut it off and let sit. After a while fire it up and watch the smoke roll!!! after that they were fine. ozz