Google Sheets Financial Data Cleanup

My financial transactions are stored in a single Google Sheets workbook. Within the next 48 hours I need every duplicate record removed so the sheet contains one clean, reliable line per transaction. Accuracy matters more than speed—totals must stay intact, formulas and column headings must remain exactly as they are, and no original data may be lost during the process. While the file lives in Google Sheets, you are free to use Excel, Power Query, or any other tool you prefer, as long as the finished data is returned in its original Google Sheets format. Deliverables (must-haves): • A duplicate-free Google Sheets file, preserving all existing formulas and formatting • A brief note (in a separate tab) outlining the steps taken so I can document the cleanup process I will check the row count against the original, spot-audit several random samples, and confirm that balances still reconcile. If everything lines up, the job is complete and approved immediately.