This study demonstrates a product-data cleanup and review workflow using 28 original synthetic records. All 28 rows are retained, with 14 rows flagged for clarification. Two duplicate-key groups contain four records, all retained. The workbook keeps the original text, documents normalization, preserves leading-zero identifiers and currency labels, and flags ambiguous values. It includes 10 text changes, 76 safe type conversions and 15 review events.