all I do is delete all the files (with godaddy's file manager, or ftp if you prefer)..... I have WP installed in a directory called wordpress, so I just deleted the entire directory.
Also, if you are trying to totally get things clean, you can delete the associated database in godaddy's database area.
Then to reinstall, creat a new database in godaddy's database area, then follow the directions to manually install....
This is for a thorough, drastic redo of WP..... you don't necessarily need to delete and start new with the DB, you can link the new WP install to the old DB with some effort. It all depends on your needs.
Also, you may not need to manually install WP, it's just that it's not that hard to do, and I've had some flaky behaviour with godaddy's auto install, so I prefer to stay manual now