Remove / Uninstall SharePoint 2013 Cleanly

SharePoint 2013 is removed by uninstalling it from Control Panel. When you uninstall SharePoint 2013, most files and subfolders in the installation folders are removed. However, some files are not removed.

1. Web.config files, index files, log files, and customization's are not automatically removed when you uninstall SharePoint 2013.
2. SQL Server databases are detached but are not removed from the database server.
3. If you uninstall a single server that has a built-in database, SQL Server Express is not removed.
4. All user data remains in the database files