Panasonic DP-MB251CX Operating Instructions Manual page 136

16. Cleaning
inside of the drum cartridge to maintain the print
quality.
R A cleaner for the drum cartridge is supplied with the
replacement toner cartridge. If you replace only the
toner cartridge, clean the drum cartridge using the
cleaner.
R Insert the cleaner (A) into the left groove (B) and
move it from side to side at least 3 times to clean the
inside of the drum cartridge. Repeat this for the right
groove (C).
A
B
Note:
R Be sure to clean all the way to the edge of each
groove.
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C