As icekohl said, the default mod uninstall only removes the commandline that was created. You need to use the mod's uninstall event to undo the changes to config files and custom scripts to delete the files.
For example:
If you configure tcadmin to add a line to xxx.cfg when a mod is installed you need to configure it to remove that line in the uninstall event (Add/Replace Lines tab > Event: Uninstall)
To delete files create a custom script for the "After mod uninstall" event. For example:
Operating System: Windows
Script engine: Batch file/shell script
Script: del /q css\cstrike\addons\eslplugin.*