Each deployment includes a batch file that you can use to automate the uninstallation of some or all of the products in the deployment. Along with the file there is a text document that explains how to customize the batch file for your use. The files are located in the <deployment name>\SMS_SCCM scripts folder, and the file names are as follows:
In summary, the process involves converting the .TXT file to a .BAT file with ANSI encoding, and then uncommenting a number of lines in the file, removing the :: characters at the beginning of the ::call :funcUninstall command line for each product that you want to uninstall.