

I believe Apple is no longer indexing certain parts of the file system with spotlight, particularly in /Library, /var etc (or at least not displaying them to the user during searches). It should be noted that your method, whilst safer than the automated apps, misses some things (at least under Mavericks and Yosemite).

In Lion and later, click the + button below the search term, then select "Name" "Contains" and enter the app name. In Snow Leopard and earlier, click "File Name" instead of "Contents" for better results.You can narrow the search to specific folders or search your whole Mac, which is preferred.Do not use "as Icons" for this procedure. In Finder, select View > "as List", if you haven't already done so.Launch Finder (see image below) and search your entire hard drive for the app name (hopefully unique, such as Skype).
UNINSTALL CAMMASK MAC
Once you've removed the app from the startup list, restart your Mac and proceed with the uninstall process below. In Finder, click Go > Go to Folder > /Library/StartupItems.In Finder, click Go > Go to Folder > ~/Library/LaunchAgents.In Finder, click Go > Go to Folder > /Library/LaunchAgents.System Preferences > Users & Groups > yourusername > Login Items (SL and older: System Preferences > Accounts > yourusername > Login Items).If that is the case, you can check the following locations for apps that automatically launch on startup and delete any you don't need/want, including the app you want to delete: In some cases, when you try to quit a process, it automatically relaunches. If it is, quit the process before proceeding. Launch Activity Monitor and change "My Processes" at the top to "All Processes", then make sure the app you want to remove is not running.To manually remove an application and all associated files: You can either perform the following search once for your entire computer, then repeat it from the Library folders, or you may elect to use a Finder alternative app until this issue is resolved.
UNINSTALL CAMMASK UPDATE
UPDATE for OS X 10.9 Mavericks: It has been discovered that on this version of OS X, Finder may not produce search results from Library folders unless the search is started in the Library folder, even if System Files are included in the search criteria. While this thread is a few months old, I'll add this for those who might find it in a search:
