Comprehensive Excel Data Cleanup

I need help whipping a large Excel spreadsheet—well over twenty columns—into shape so it’s ready for analysis and reporting. The file is already in .xlsx format; the work is purely about tidying what’s inside it, not migrating it from another source.

Here’s exactly what must happen:
• Remove duplicates so each record is unique.
• Correct obvious data errors—typos, misplaced values, or broken formulas.
• Standardize formats for dates, numbers, text casing, and any other inconsistent fields.

Once the cleanup is complete, send back:
1. The fully refreshed spreadsheet, ready for immediate use.
2. A brief changelog or summary sheet that notes the main fixes you performed (helpful for audit purposes).

If you use Power Query, VBA, or other Excel-native techniques, great—just keep everything self-contained in the workbook. Turnaround is flexible for a quality job, but sooner is better. Let me know your approach and estimated timeframe, and we can get started right away.