Many developer faces the issue of cleaning unused database table or system variable that left there by uninstalled modules.

Some of the contrib drupal modules just didn't perform cleaning of its own database system variable or table when we uninstall it.

Now we have a solution to quickly clean it up using the System table cleaner module

The module is still in dev version, so don't use them in a live production site. It is still very helpful if we need to clean our local dev site before submitting it to a live production site.

Try them and if you find bugs let the module maintainer know so they can fix them.

Project page : http://drupal.org/project/system_table_cleaner