diff --git a/Assets/VRM10/Runtime/Components/Expression/MaterialValueBindingMerger.cs b/Assets/VRM10/Runtime/Components/Expression/MaterialValueBindingMerger.cs
index bdd6b20bd..495ccfd90 100644
--- a/Assets/VRM10/Runtime/Components/Expression/MaterialValueBindingMerger.cs
+++ b/Assets/VRM10/Runtime/Components/Expression/MaterialValueBindingMerger.cs
@@ -115,7 +115,7 @@ namespace UniVRM10
         {
             foreach (var kv in m_materialMap)
             {
-                kv.Value.RestoreInitialValues();
+                kv.Value.Clear();
             }
         }
         #endregion
diff --git a/Assets/VRM10/Runtime/Components/Expression/PreviewMaterialItem.cs b/Assets/VRM10/Runtime/Components/Expression/PreviewMaterialItem.cs
index 707223bf4..ae98b9a77 100644
--- a/Assets/VRM10/Runtime/Components/Expression/PreviewMaterialItem.cs
+++ b/Assets/VRM10/Runtime/Components/Expression/PreviewMaterialItem.cs
@@ -71,14 +71,6 @@ namespace UniVRM10
             set;
         }
 
-        public void RestoreInitialValues()
-        {
-            foreach (var prop in PropMap)
-            {
-                Material.SetColor(prop.Value.Name, prop.Value.DefaultValues);
-            }
-        }
-
         public static readonly string COLOR_PROPERTY = MToon10Prop.BaseColorFactor.ToUnityShaderLabName();
         public static readonly string EMISSION_COLOR_PROPERTY = MToon10Prop.EmissiveFactor.ToUnityShaderLabName();
         public static readonly string RIM_COLOR_PROPERTY = MToon10Prop.ParametricRimColorFactor.ToUnityShaderLabName();