Remove Duplicate Objects in the Scene

I am currenting using iThor for some object navigation tasks. I need to generate some duplicates of objects in a given scene. However, whenever I reset the environment using `controller.reset()`, the duplicated objects (named with "_random_copy_") still appear in the scene. Is there a conveninent way that I missed in the documentation that could auto-remove the duplicated objects? If not, I guess I would have to manually remove them by search for their names.