IEC/TR 62572-4@ which is a technical report@ provides guidelines for optical connector endface cleaning methods for receptacle style optical transceivers. It includes details about handling receptacle style optical transceivers@ internal structures of optical transceivers@ information on cleaning tools and machines@ applicable cleaning methods and cleaning procedures. Receptacle style optical transceivers as well as optical fibre patch cords are handled by operators and maintenance staff of optical network systems. This technical report may be used as a guideline to prepare instruction manuals for the operators and maintenance staff of optical network systems.