Large Excel Duplicate Removal

I have an Excel workbook with well over 10,000 rows that needs a careful duplicate purge. The task is straightforward: identify every repeated record according to the criteria I’ll supply once we start, remove the extras, and return a clean file that matches the original structure in every other respect. Please work directly in Excel—Power Query, advanced filters, or VBA are all fine as long as the result is 100 % accurate and no data is lost beyond the intended duplicates. Alongside the cleaned workbook, include a brief summary noting: • the rule you applied to spot duplicates • the starting and ending row counts Accuracy and a quick turnaround are more important to me than fancy presentation, so if you have a solid method for large-sheet de-duplication, this should be a smooth job.