I wrote this SMS Installer Script to delete the "remnants" of the SMS client after 20clicln.bat completed. This will wipe out the remaining registry and file structure components, including C:\windows\smscfg.ini. Running this .ini makes for a cleaner reinstall of the SMS client software.
The "best practice" for removing an SMS client is as follows:
1 Run 20clicln.bat,
3 Run CliCln2.exe
4 Remove client from the database