I never have to use harsher than simple green on my stuff. I do have a semi cheapy pressure washer that works awsome with reg hot water but I also have an electric/diesel burning Hotsy that will burn your meat off your bones, she got some recoil when you pull the trigger. Kinda like this one just older model.
http://hotsy.com/ViewCategories.aspx?Cid=551
http://hotsy.com/ViewCategories.aspx?Cid=551