Turn a messy CSV or Excel export into a reliable, analysis-ready file without losing traceability. I will clean up to 2,000 rows, standardize dates, currency, whitespace and column names, remove duplicates, flag uncertain or invalid records instead of guessing, and deliver the cleaned file with a concise quality report. The work includes manual QA of representative rows and one revision within the agreed scope. To begin, send the source file, explain its intended use, and identify any columns that must remain unchanged.