Final answer:
The master cleaning schedule should include instructions on how it is to be cleaned and sign-off sheets for job completion verification to maintain cleanliness standards and accountability.
Step-by-step explanation:
The master cleaning schedule should include what is to be cleaned, who is to clean it, when it is to be cleaned and both B. how it is to be cleaned and C. sign-off sheets verifying the job has been completed. Ensuring that each task is performed correctly and verified helps maintain a consistent standard of cleanliness and accountability within an organisation. Sign-off sheets serve as evidence that the tasks were completed as scheduled and allows for tracking of completion and quality.