The fist step in cleaning is basically thinning any trapped paint more and the dirty stuff can still do that fine & dandy to the point of thickening enough to spray as paint (if the color was useful) I'm a bit of tree hugger too. Nothing extreme, but definitely not wasteful for the convinience of avoiding "ewe gross" and gaining a foot of shelf space 
Don, try the double action; you might be happy with the better control. Somebody is always a 'natural'; why not you? 😉
