For clearing down the blank mesh renderers from ProDrawCall - Works on Selected items + children

RemoveOrphanRenderers.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using System.Linq;

// Select some Gameobjects in the scene view to use this
public class RipOrphanRenderers {

	[MenuItem("Window/Remove Orphaned Disabled Renderers")]
	static void RipOrphans()
	{

		var objs = Selection.gameObjects;

		foreach (var go in objs) {

			foreach(Transform child in go.transform)
			{
				
				if ( child.gameObject.name.Contains ("LOD")) {

					MeshRenderer mr =  child.gameObject.GetComponent<MeshRenderer> ();

					if (mr != null) {

						if (!mr.enabled) {

							SafeDestroy ( child.gameObject);

						}
					}
				}
			}
		}
	}

	public static T SafeDestroy<T>(T obj) where T : Object
	{
		if (Application.isEditor)
			Object.DestroyImmediate(obj);
		else
			Object.Destroy(obj);

		return null;
	}
	public static T SafeDestroyGameObject<T>(T component) where T : Component
	{
		if (component != null)
			SafeDestroy(component.gameObject);
		return null;
	} 

}