Get EasyFind (looks like it's only available directly from the App Store now. That's a shame.)
http://www.devontechnologies.com/download/products.html
EDIT You can get from MacUpdate
http://www.macupdate.com/app/mac/11076/easyfind
(Spotlight/Finder won't work well for this.) Set it to scan all files, files and folders, case insensitive, invisible. Enter the name of the app, the developer or any other way it might be identified. Search using phrase, all words, and boolean.
You can use Destroy from the EasyFind Menu. But if it's a file that requires a password (you'll know it is if nothing happens when you "Destroy"), then select the file/folder use Reveal in Finder, select the file>move to trash>and enter your password at the prompt.
Be careful not to delete anything that is part of a Shared Lilbrary; i.e. used by some other applicaton.
For very complicated applications with files all over the system, best to rely on the provided uninstaller, if possible.
For very simple applications, just move the app to the Trash. Searching with EasyFind, you will probably find a few other, small items in your /User/Library. These can be deleted with no harmful consequences.
Message was edited by: WZZZ