This is an old subject but worth rehashing again. How many of you use Simple Green and hot water to clean your firearms? There's a lot of false information floating around about utilizing water to clean guns because the fear of rust. However, I believe it's the American Gunsmithing Institute also highly recommends Simple Green and hot water.
At any rate, I use it in an Ultrasonic Cleaner and it's one hell of a degreaser. After using it in the UC, I rinse it thoroughly with hot water. Then it gets baked in the oven for 10 minutes for a thorough drying. Afterwards, the gun gets lubed.