I just bought a complete TP Tools HVLP setup from a friend. It came with two guns which he used a couple times each to spray a frame and a few other parts on a car he was working on. He's more of a woodworking guy than a car guy and for some reason didn't do a very good job cleaning the guns after using them. Maybe he just didn't realize the importance. Anyhow, is there any good cleaner out there I can let the parts sit in to soften or dissolve the hardened paint? Don't get the wrong impression, there isn't caked on paint on these things, but there is enough residue to want clean them up before I put them into service.