gary I have the 6inch version of this tool as well but always use this on stairs and some upholstery. it is a lot better for getting in the nooks & crannies and over the bullnose
it has a wand soft touch valve fitted which will handle very high temps. and on these stairs I was hitting them with about 400psi.
i filmed those stairs, they are in an Chinese restaurant leading upto the staff living quarters and are thick grease, if you tap them they sound like wood, you really have to dig the tool into the grease to clean it out
please ignore my bald head
http://www.youtube.com/watch?v=fWefK7VtVDA