Excel Data Cleanup & Structuring

I have a single Excel workbook filled with customer and other contact-related details that now needs thorough, professional cleanup. You will start by removing every repeated record except the very first instance, then clear out blank rows and any obvious data-entry errors... (Budget: ₹750 - ₹1250 INR, Jobs: Data Analysis, Data Cleansing, Data Entry, Data Management, Data Processing, Excel, Excel VBA, Google Sheets)