Didn’t do what I needed it to

When I add up the storage used in my folders (including applications), the total is 22 GB. But “About this Mac” says I’m using close to 60 GB! Trying to find an app that will help me locate what on my hard drive is taking up space. This one just searches the folders you select, and I can tell what’s in those.

Drowsy Smurf about HD Cleaner - Free up Disk Space on your Hard Drive