title: Using leaflet.js, how do I iterate through markers in a cluster?
body: <p>Se we have a map and at a certain zoom level we start clustering the markers.</p>
  
  <p>Now I want to be able to delete certain markers.  I can delete the markers that don't participate in a cluster but the markers in a cluster do not get deleted because the code doesn't iterate through them.</p>
  
  <p>I'd post code but it's all over the place and quite specific.</p>
  
  <p>I can do the following;</p>
  
  <pre><code>$.each(MAP._layers, function (i, layer) {
      if (layer.feature) {
          var marker = LIGHTWEIGHT_BUILDING_MAPPING[layer.feature.id];
          MAP.removeLayer(marker);
      }
  });
  </code></pre>
  
  <p>And all the visible markers are removed but not the ones within a cluster.  Any thoughts?</p>