Marketing data cleansing in CRM refers to the process of identifying and removing duplicate, outdated, or inaccurate data within a customer database. Businesses use automated data scrubbing tools to enhance data quality, segmentation accuracy, and campaign effectiveness. Clean CRM data reduces bounce rates, improves personalization, and ensures compliance with data privacy regulations. Regular data hygiene practices help organizations maintain a reliable database, ensuring that sales and marketing teams work with accurate customer insights.