Have you seen this iron-cleaning trick? You are supposed to pour the vinegar through your iron's water duct, but this little tip can damage the iron. You're better off following the manufacturer's instructions in this case.
So many online DIY sites tell you to put a splash of vinegar in with your clothing and dishes. While this may get your wearables and dishes clean, it can be hard on the rubber parts in your appliances. If you don't want to replace hoses and seals sooner then you need to, skip the vinegar.
Since vinegar is great at cleaning clothes, mixing it with bleach sounds like a great idea, right? Nope. Mixing vinegar with bleach creates toxic chlorine gas. When mixed with water the gas creates hydrochloric and hypochlorous acids. The gas by itself isn't good for you, but mix it with water and your clothing will be completely ruined.
Vinegar just doesn't work on removing grease from surfaces because it is an acid. Use an alkaline soap, such as dish soap, for oil spills and messes like your Fry Daddy. The University of Nebraska has a fascinating explanation of cleaning science that explains acid verses alkaline.