Canon iR4570 Series Service Manual page 660

Chapter 12
B. Cleaning the Developing Spacer and the Feed Guide
1) Clean the developing assembly spacer [1] and the feed guide [2]. (Dry wipe them using lint-free paper.)
C. Cleaning the Dust-Blocking Glass
1) Clean the dust-blocking glass [1]. (Dry wipe it, or use alcohol.)
D. Cleaning the Fixing Inlet Guide
12-16
F-12-13
F-12-14
F-12-15