You would think they could at least clean the [censored] things when their done too. I once borrowed a binks paint gun from an old freind spent a better part of an hour explaining to him it was actually his and how I cleaned it!
Would you like to borrow my Campbell Hausfield Airless Paint Sprayer? The last guy that borrowed it didnt clean it and I'm still looking for a "gently used" gun for it :-D I'm sure a few hours of soaking and scrubbing will make it shiny new!