How to automatically delete unused objects in a mod?

When an item is dropped in the world thru the Constructor and after is removed, that object remains in the esp. I would like to clean the mod.

Is there a way or software?

You can use http://planetelderscrolls.gamespy.com/View.php?view=other.detail&id=52 to remove these from the esp.

(you can also use http://planetelderscrolls.gamespy.com/View.php?view=other.detail&id=53. They are very similar, but EE is a bit more user friendly.)