Process cartridge and developing cartridge

A cartridge detachably mountable to a main assembly of an image forming apparatus, said cartridge comprising:

• a photosensitive member unit including a photosensitive drum;
• a sheet configured to remove a deposited matter from a surface of said photosensitive drum, said sheet being in contact with the surface of said photosensitive drum at an end portion of said photosensitive drum with respect to a rotational axis direction of said photosensitive member;
• and
• a developing unit detachably mounted to said photosensitive member unit, said developing unit including a developing roller configured to supply toner to said photosensitive drum, and a storage portion configured to store the deposited matter removed from the surface of said photosensitive drum by said sheet.