Clean built targets in IntelliJ.

Summary: Clean built targets by running `buck clean`.
diff --git a/plugin/src/com/facebook/buck/plugin/intellij/BuckPluginComponent.java b/plugin/src/com/facebook/buck/plugin/intellij/BuckPluginComponent.java
index 752bb81..5d383a6 100644
--- a/plugin/src/com/facebook/buck/plugin/intellij/BuckPluginComponent.java
+++ b/plugin/src/com/facebook/buck/plugin/intellij/BuckPluginComponent.java
@@ -17,6 +17,7 @@
 package com.facebook.buck.plugin.intellij;
 
 import com.facebook.buck.plugin.intellij.commands.BuckRunner;
+import com.facebook.buck.plugin.intellij.commands.CleanCommand;
 import com.facebook.buck.plugin.intellij.commands.SocketClient.BuckPluginEventListener;
 import com.facebook.buck.plugin.intellij.commands.TargetsCommand;
 import com.facebook.buck.plugin.intellij.commands.event.Event;
@@ -98,6 +99,22 @@
     task.queue();
   }
 
+  public void clean() {
+    if (!checkBuckRunner()) {
+      return;
+    }
+    Task.Backgroundable task = new Task.Backgroundable(project,
+        "Cleaning",
+        true, /* canBeCanceled */
+        BackgroundFromStartOption.getInstance()) {
+      public void run(ProgressIndicator progressIndicator) {
+        CleanCommand.clean(buckRunner.get());
+        // TODO(user) Clear built targets on UI
+      }
+    };
+    task.queue();
+  }
+
   private class EventListener implements BuckPluginEventListener {
 
     @Override
diff --git a/plugin/src/com/facebook/buck/plugin/intellij/commands/CleanCommand.java b/plugin/src/com/facebook/buck/plugin/intellij/commands/CleanCommand.java
new file mode 100644
index 0000000..a52f354
--- /dev/null
+++ b/plugin/src/com/facebook/buck/plugin/intellij/commands/CleanCommand.java
@@ -0,0 +1,18 @@
+package com.facebook.buck.plugin.intellij.commands;
+
+import com.intellij.openapi.diagnostic.Logger;
+
+public class CleanCommand {
+
+  private static final Logger LOG = Logger.getInstance(CleanCommand.class);
+
+  private CleanCommand() {}
+
+  public static void clean(BuckRunner buckRunner) {
+    int exitCode = buckRunner.execute("clean");
+    if (exitCode != 0) {
+      LOG.error(buckRunner.getStderr());
+      return;
+    }
+  }
+}