While I do plan on adding the AddThis plugin back, I removed the plugin via the WordPress 3.1.3 GUI (including deleting the associated files via the GUI), but AddThis continues to remain being associated with brand new posts and pages.
1. Why wasn't the inactivation and subsequent removal of AddThis enough to have it remove all database entries so that existing and new pages and posts do not have AddThis associated with them?
Example: See http://www.dynamicnet.net/managed-hosting/shared-web-hosting/overselling-guarantee/ where AddThis is under the words, "supersedes this guarantee." even though we have the plugin removed completely via the WordPress 3.1.3 GUI.
2. What steps are necessary to do what the uninstaller should have done to clean up the code / database?