We have few cleanup tasks to be done.
1. Add error checks/variable validation
2. Remove any un-required/stale comments
3. Add comments wherever necessary.
4. Review TODOs and address any important EA blockers
5. Fix warnings
6. Java coding guidelines
7, Objective coding guidelines
8. Remove dead code
9. Error fallback/ no service / no memory /

We can do this file level, by creating a new sub task for set of files as and when we fix.