This is because the plugins are Setting data into the wp_options
table in your database. To edit this data you have some options
- Go to example.com/wp-admin/options.php which will display all of the data in the options table and then you can try to remove the data you don’t want (this is the easiest but doesn’t work in all cases)
- Use a plugin: http://wordpress.org/extend/plugins/tags/wp_options has some that may work I’ve never had experience with any of them but they may be worth a try.
- Edit the database directly. This is done either in PHPmyadmin or from comand line. Just find the
wp_options
table and remove your settings - Do a completely new install of WordPress and then export/import the data (this may be the best solution if you don’t want to mess with the database)
WARNING It’s extremly easy to mess things up when changing/removing things from the database. proceed with caustion and always back up your database first.