My friend that showed me how to hand load did not clean his brass. I didn't either initially. After getting on some of the forums, I thought I needed to clean. I used a sonic cleaner, a very quiet method. Now I have gone full circle. My rifle brass does not hit the ground. I clean the outside with a microfiber cloth and call it good. I want the carbon in the neck. I see no buildup of carbon in the case. Just think of the pressure and temperature inside the case. Think about how a self cleaning oven works. The cases are pretty much self cleaning on the inside.