To manually find and delete duplicate files, you can use Finder or the Smart Folder feature. Open Finder, select "File," and then "New Smart Folder." Set search criteria such as file type or size, and sort files by name to spot duplicates. However, this method is time-consuming and prone to human error, as finding duplicates manually can be inefficient, especially if you have a large number of files.

A simpler approach is using Cigati Find & Delete Duplicate Files, which automates the process. This tool quickly scans your data, identifies duplicate files, and allows you to delete them in a few clicks. It saves time and ensures no files are missed. However, while it's efficient, the tool might require a small learning curve and purchase for full access to its features. Despite this, it's a reliable option for maintaining a clutter-free PC.