For anyone else who was confused - it seems to be a different name for rinse aid.

It is a surfactant (breaks surface tension). I am not an American and I had to Google it a few months ago to figure out what it was. I think it is avaliable here in New Zealand but I have never ever seen anyone use it.

Yeah, it's called rinse aid elsewhere - I'm surprised anyone still uses it, as multitabs have replaced all the separate detergents used(remember having to add salt to your dishwasher?). In fact my dishwasher has a separate setting that you need to enable if you aren't using multitabs, then it will start consuming rinse aid from a separate container. By default it doesn't use any.