Using Anti-freeze to Clean engines?
Your are heating up a chemical that is highly toxic, as in poisonous, you'd better assume there are toxic emanations from this chemical that is going to be heated for hours.
Have it near an open window or outside (safer), do not have this thing going near pets or where humans are going to be for some period of time, a spinning prop is one of the most feared accidents waiting to happen in our modeling world, but in reality, there are many others, that are just as dangerous, if not more.
Almost all the chemicals we use will harm us, if we are not careful, I have friends that have developed a terrible allergy to epoxy resins and Ca glues, that's why I am an advocate to the water based ones like Titebond, etc.