diff --git a/src/Decentralized/ShowcaseCases.cs b/src/Decentralized/ShowcaseCases.cs
index 69579b9..acf2c41 100644
--- a/src/Decentralized/ShowcaseCases.cs
+++ b/src/Decentralized/ShowcaseCases.cs
@@ -99,14 +99,19 @@ namespace Decentralized
                 Place(item);
                 Log.Info($"展示样例（鉴定）{_next}/{All.Count}：{c.Name}");
             }));
-            ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Clear counter + half of storage (test)", () => Log.Guard("清柜台与一半储物", () =>
+            ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Clear desk + half of storage and machine bays (test)", () => Log.Guard("清柜台与一半储物", () =>
             {
                 var e = EmporiumEntry.Instance;
                 int counter = 0, bays = 0;
-                foreach (var it in e.backInvinvElement.childItems.ToList()) { it.Destroy(); counter++; }
-                var storage = e.invElement.childItems.Where(i => i.identifier != null && i.identifier.StartsWith("storage_bay")).ToList();
-                for (int i = 0; i < storage.Count; i += 2) { storage[i].Destroy(); bays++; }
-                Log.Info($"清空柜台 {counter} 件；储物箱 {storage.Count} 个里去掉 {bays} 个");
+                foreach (var inv in new[] { e.backInvinvElement, e.backInvinvElementCounter, e.frontInvinvElement })
+                    if (inv != null) foreach (var it in inv.childItems.ToList()) { it.Destroy(); counter++; }
+                var storage = e.invElement.childItems.Where(i => i.identifier != null && (i.identifier.StartsWith("storage_bay") || i.identifier.StartsWith("machine_bay"))).ToList();
+                foreach (var kind in storage.GroupBy(i => i.identifier))
+                {
+                    var list = kind.ToList();
+                    for (int i = 0; i < list.Count; i += 2) { list[i].Destroy(); bays++; }
+                }
+                Log.Info($"清空桌面 {counter} 件；储藏区和机器区 {storage.Count} 个里去掉 {bays} 个");
             }));
             ModHelper.AddDebugFunction(ModInfo.Id, ModInfo.Name, "Paper: dump starters (test)", () => Log.Guard("纸张起点", () =>
             {