What type of cleaning is specifically mentioned for the MMR?

The mention of closing the "air-saver-switch" and bypass valve indicates an important step in preparing the MMR (Multi-Media Respiratory) for cleaning. This action is necessary to ensure that no air is escaping and that the device is rendered safe for cleaning. By doing so, it helps to prevent accidental inhalation of contaminants that may have accumulated during use.

The correct procedure typically emphasizes the importance of maintaining a clean and functional device, ensuring that all mechanisms operate correctly without leaks. This step ensures that the internal components are protected during the cleaning process, safeguarding both the equipment and the user.

Other options do not directly pertain to specific cleaning processes recommended for the MMR. Rinsing under cold water, submerging in a cleaning solution, or wiping with a dry cloth might be relevant to other devices or surfaces but do not directly address the preparation of the MMR for proper cleaning.