diff --git a/o.n.swing.outline/apichanges.xml b/o.n.swing.outline/apichanges.xml
--- a/o.n.swing.outline/apichanges.xml
+++ b/o.n.swing.outline/apichanges.xml
@@ -170,6 +170,20 @@
       <class package="org.netbeans.swing.outline" name="CheckRenderDataProvider"/>
       <issue number="159546"/>
     </change>
+    <change id="columns_clean">
+      <api name="etable_outline"/>
+      <summary>Add a way to clean all columns from the column model, including hidden ones.</summary>
+      <version major="1" minor="12"/>
+      <date day="16" month="2" year="2011"/>
+      <author login="mentlicher"/>
+      <compatibility addition="yes" binary="compatible" deprecation="no"/>
+      <description>
+        <p>Added <code>ETableColumnModel.clean()</code> method.
+        </p>
+      </description>
+      <class package="org.netbeans.swing.etable" name="ETableColumnModel"/>
+      <issue number="195226"/>
+    </change>
 
 </changes>
 
diff --git a/o.n.swing.outline/manifest.mf b/o.n.swing.outline/manifest.mf
--- a/o.n.swing.outline/manifest.mf
+++ b/o.n.swing.outline/manifest.mf
@@ -1,5 +1,5 @@
 Manifest-Version: 1.0
 OpenIDE-Module: org.netbeans.swing.outline
 OpenIDE-Module-Localizing-Bundle: org/netbeans/swing/outline/Bundle.properties
-OpenIDE-Module-Specification-Version: 1.11
+OpenIDE-Module-Specification-Version: 1.12
 
diff --git a/o.n.swing.outline/src/org/netbeans/swing/etable/ETableColumnModel.java b/o.n.swing.outline/src/org/netbeans/swing/etable/ETableColumnModel.java
--- a/o.n.swing.outline/src/org/netbeans/swing/etable/ETableColumnModel.java
+++ b/o.n.swing.outline/src/org/netbeans/swing/etable/ETableColumnModel.java
@@ -329,8 +329,11 @@
         return sortedColumns;
     }
 
-    /** Removes all columns, including hidden ones. TODO: Add to public APIs */
-    void clean() {
+    /**
+     * Removes all columns, including hidden ones.
+     * @since 1.12
+     */
+    public void clean() {
         List<TableColumn> allColumns = new ArrayList<TableColumn>(tableColumns.size() + hiddenColumns.size());
         allColumns.addAll(tableColumns);
         allColumns.addAll(hiddenColumns);
diff --git a/openide.explorer/nbproject/project.xml b/openide.explorer/nbproject/project.xml
--- a/openide.explorer/nbproject/project.xml
+++ b/openide.explorer/nbproject/project.xml
@@ -54,7 +54,7 @@
                     <build-prerequisite/>
                     <compile-dependency/>
                     <run-dependency>
-                        <specification-version>1.4</specification-version>
+                        <specification-version>1.12</specification-version>
                     </run-dependency>
                 </dependency>
                 <dependency>
diff --git a/openide.explorer/src/org/openide/explorer/view/OutlineView.java b/openide.explorer/src/org/openide/explorer/view/OutlineView.java
--- a/openide.explorer/src/org/openide/explorer/view/OutlineView.java
+++ b/openide.explorer/src/org/openide/explorer/view/OutlineView.java
@@ -456,13 +456,7 @@
         if (doCleanColumns) {
             TableColumnModel tcm = outline.getColumnModel();
             if (tcm instanceof ETableColumnModel) {
-                try {
-                    java.lang.reflect.Method cleanMethod = ETableColumnModel.class.getDeclaredMethod("clean");
-                    cleanMethod.setAccessible(true);
-                    cleanMethod.invoke(tcm);
-                } catch (Exception ex) {
-                    Exceptions.printStackTrace(ex);
-                }
+                ((ETableColumnModel) tcm).clean();
             }
         }
         rowModel.setProperties(newProperties);