This is the software publisher's description.

HDCleaner is the easiest and most comprehensive way to keep your PC running smooth and error free. There may be many junk files in your hard disk when your computer is running. They would make the computer system work slowly and astatically. HDCleaner uses a highly intelligent engine to scan your hard disk & improve PC performance! You needn't know about the system and file types. Only click your mouse, it will clean all the junk files quickly and safely. It is designed for all windows. It protects your privacy by removing all the unwanted traces in your system. It safely removes Web cookies, Web history, recent documents history, any hidden user traces and more with just a click. System Cleaner and Optimizer: It removes junk and obsolete files from your system and frees valuable system space. System Files Backup and Restore: It lets back up your files and restore it in case of System Failure. Registry Cleaner and Optimizer: Enhanced regclean or regcleaner in short. It cleans the Windows Database Registry for invalid information such Invalid Fonts, shortcuts to files.

HDCleaner implements the US Department of Defense and NSA clearing and sanitizing standard, which gives you confidence that once deleted with HDCleaner, your file data is gone forever and can not be recovered.

HDCleaner also identifies garbage files on the HDD of the network computers.