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Assets/CGHierarchyIcons/Editor/UnityCallbacks/DestroyInstancesOnBuild.cs

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+using System;
+using System.Collections.Generic;
+using HierarchyIcons;
+using UnityEditor;
+using UnityEditor.Callbacks;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+// https://forum.unity.com/threads/excluding-certain-monobehaviour-classes-from-build.568090/#post-3779695
+public class DestroyInstancesOnBuild : MonoBehaviour
+{
+    [PostProcessScene]
+    public static void DeleteObjects()
+    {
+        if (BuildPipeline.isBuildingPlayer)
+        {
+            Type type = typeof(HierarchyIcon);
+            Debug.Log("Destroying all instances of '" + type.Name + "' from scenes on build!");
+
+            foreach (Component obj in FindObjectsOfTypeAll(type, true))
+                DestroyImmediate(obj);
+        }
+    }
+
+    static List<Component> FindObjectsOfTypeAll(Type type, bool findInactive = false)
+    {
+        List<Component> results = new List<Component>();
+        for (int i = 0; i < SceneManager.sceneCount; i++)
+        {
+            Scene scene = SceneManager.GetSceneAt(i);
+            if (scene.isLoaded)
+            {
+                GameObject[] allGameObjects = scene.GetRootGameObjects();
+                for (int j = 0; j < allGameObjects.Length; j++)
+                {
+                    GameObject go = allGameObjects[j];
+                    results.AddRange(go.GetComponentsInChildren(type, findInactive));
+                }
+            }
+        }
+
+        return results;
+    }
+}