Alex Hamilton’s eighth lesson covers the critical, often overlooked process of cleaning watch parts without expensive machinery. He outlines a four-stage system—one wash and three rinse cycles—designed to achieve “chemically clean” parts free from residue that could otherwise displace lubricants. The tutorial provides practical alternatives to professional cleaning solutions, such as Naptha and 99% isopropyl alcohol, while demonstrating essential manual techniques like “pegging” jewel holes with pegwood and using Rodico for pivots. Hamilton also shares a clever DIY solution for a spinning parts basket and emphasizes the importance of drying parts with mild heat to prevent condensation and rust.