Note on Cloud Storage: Files stored in cloud services like Dropbox, OneDrive, or Google Drive are not technically "on your computer." They exist on remote servers. While the local copy of these files will be deleted during a clean install, you can re-download them once you reinstall the cloud sync software and log in.
: Most viruses, spyware, and unwanted "bloatware" programs pre-installed by the manufacturer. What Is NOT Erased? does a clean install erase everything
If you proceed with a clean install, the following will be permanently deleted: Note on Cloud Storage: Files stored in cloud