The document provides guidance on cleaning data by summarizing three main steps:
1) Create a style sheet to define data elements and establish naming conventions.
2) Fill in missing data fields and prioritize which need to be completed.
3) Organize the data into the proper structure and fields.
It emphasizes that establishing guidelines and enforcing good data practices are important for ongoing maintenance and improving data quality over time. The overall message is that cleaning data is worthwhile and can be done through approachable initial steps.