Cleanilng dies, shellholders and bushings is often overlooked. I peek inside my dies with each use. If I see any dirt, I spray them with brake cleaner and wipe with a Q tip. Take the sizer die apart, spray the expander and its stem, wipe with paper towel. Seater die, very important - remove the seater stem and thoroughly clean the meplat cup (where the bullet tip goes). Wipe it dry with a Q tip. Die threads also need to be cleaned.