Clean Mixed Spreadsheet Data Set

I have several spreadsheets that hold both text and numerical fields, and they need a thorough clean-up. The job involves identifying and correcting inconsistencies, removing duplicates, fixing obvious entry errors, standardizing formats (dates, currencies, categorical labels), and flagging any outliers that may require my review.

You’re free to use Excel, Google Sheets, Power Query, Python (pandas), or any other reliable tool you prefer—as long as the final files return to me as tidy, well-structured spreadsheets ready for analysis. Please include a short log or summary of the key issues you found and how you resolved them so I can track what changed.