How to Clean Your Customer List: A Cross-Channel Verification Guide for CRM's 22.5% Annual Data Decay and Year-End Black Friday

This article breaks down a practical customer list cleaning solution to address the annual natural decay rate of over 22.5% in customer lists and the strict requirements for data authenticity during year-end Black Friday/Cyber Monday and AI automated outbound calls. It covers local browser-based E.164 formatting and deduplication, basic invalid number and US high-risk number blocking, cross-platform status verification for WhatsApp, Telegram, Amazon, etc., and API automation integration.