I've created uninstall scripts for the various Creo versions we've used. Usually I run the silent_Group_Uninstall.bat first, then run additional commands to remove the items still left behind. Looking at a couple of my old scripts, I had to remove Thumbnail Viewer independently on one, and Platform Services independently on another.
Usually if I search for the specific piece I need to uninstall, I can find the right command in the Support pages. Hope that helps.
