Cleaning Coins and the 1-70 Grading Reality: Why "50% Value Loss" Is an Oversimplification

https://varimail.com/articles/how-a-simple-grade-move-turned-a-kid-into-a-serious-coin-steward/

Understand How Cleaning Changes Value: What You'll Master Today In this tutorial you'll learn how the 1-70 grading scale treats cleaned coins, how to spot cleaned surfaces, and when cleaning actually ruins value versus when it merely changes