diff --git a/js/concentration/model/Dropper.js b/js/concentration/model/Dropper.js
index ed95787e..39589ceb 100644
--- a/js/concentration/model/Dropper.js
+++ b/js/concentration/model/Dropper.js
@@ -51,8 +51,6 @@ define( function( require ) {
         thisDropper.enabled.set( false );
       }
     } );
-
-    //together && together.addComponent( 'concentrationScreen.dropper.location', thisDropper.locationProperty );
   }
 
   return inherit( Movable, Dropper, {
diff --git a/js/concentration/view/SoluteComboBox.js b/js/concentration/view/SoluteComboBox.js
index 97bf80cc..cabafd38 100644
--- a/js/concentration/view/SoluteComboBox.js
+++ b/js/concentration/view/SoluteComboBox.js
@@ -45,8 +45,7 @@ define( function( require ) {
       listPosition: 'below',
       itemYMargin: 12,
       itemHighlightFill: 'rgb(218,255,255)',
-      buttonNodeComponentID: 'concentrationScreen.soluteComboBox',
-      listNodeVisiblePropertyID: 'concentrationScreen.soluteComboBox.listVisible'
+      buttonNodeComponentID: 'concentrationScreen.soluteComboBox'
     } );
   }