"…[Windows] Disk Cleanup doesn’t go as far as it could. For example, while it can delete Internet Explorer’s cache files, it won’t touch cache files for other browsers like Chrome and Firefox. It won’t delete the useless setup folders NVIDIA’s graphics driver installers create when you update your graphics drivers, which can consume hundreds of megabytes each… CCleaner does do these things and more. It takes the Disk Cleanup concept and runs with it, extending it to more data in Windows and third-party programs that the Windows Disk Cleanup tool won’t touch…
If you have an old PC that you’ve never run CCleaner or even Disk Cleanup on, you should give it a go."
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