Even after removing circles on the Google Map, the labels still persist. I use InfoBox to display labels on circles like this:

myOptions.content = datadetail[i].Count;
var ibLabel = new InfoBox(myOptions);
ibLabel.open(map);

I am trying to clear the circles in the ZoomIn/ZoomOut event under certain conditions. The circles are cleared but the labels remain visible. Here is my complete script. Thank you.

<script>
    var gmarkers = [];
    var gmlist = [];
    var fill_color_val = '#3888ff';
    var labelText = "1";
    var currentZoom = 0;
    $(function () {
        function initialize_map() {
            var mapProp = {
                minZoom: 11,
                maxZoom: 20,
                center: new google.maps.LatLng(16.7803886, 96.1844148),
                zoom: 12,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            map = new google.maps.Map(document.getElementById("map"), mapProp);
            bindMarkerOnMap("level_0");
        }

        initialize_map();

        map.addListener('zoom_changed', function () {
            currentZoom = map.getZoom();
            if (currentZoom <= 12) {
                ClearMapMaker();
                console.log(map.getZoom());
                bindMarkerOnMap("level_0");
            } else if (currentZoom >= 13) {
                console.log("level_1 fired + " + currentZoom);
                ClearMapMaker()
                console.log(map.getZoom());
                bindMarkerOnMap("level_1");
            }else if (currentZoom >= 15) {
                bindMarkerOnMap("level_2");
            }
        });

    });

    function bindMarkerOnMap(level) {
        console.log(level);
        if (level == "level_0") {
            console.log("level_0 binding");
            for (var i = 0; i < data.length; i++) {
                var latlng = new google.maps.LatLng(data[i].Lat, data[i].Long);

                var myOptions = {
                    content: labelText,
                    boxStyle: {
                        border: "none",
                        textAlign: "center",
                        fontSize: "10pt",
                        width: "50px"
                    },
                    disableAutoPan: true,
                    pixelOffset: new google.maps.Size(-25, -5),
                    position: latlng,
                    closeBoxURL: "",
                    isHidden: false,
                    pane: "floatPane",
                    enableEventPropagation: true
                };

                // Add circle overlay and bind to marker
                var circle = new google.maps.Circle({
                    map: map,
                    radius: 1600, 
                    fillColor: fill_color_val,
                    strokeColor: '#69DAED',
                    strokeWeight: 2,
                    fillOpacity: 1,
                });

                var marker = new google.maps.Marker({
                    position: latlng,
                    title: data[i].Author,
                    draggable: false,
                    map: map
                });
                marker.setVisible(false);

                circle.bindTo('center', marker, 'position');

                google.maps.event.addListener(circle, 'click', getInfoCallback(map, latlng));

                myOptions.content = data[i].Count;
                var ibLabel = new InfoBox(myOptions);
                ibLabel.open(map);
                gmarkers.push(circle);
                gmlist.push(marker);
            }
        } else if (level == "level_1") {
            console.log("level_1 binding");
            for (var i = 0; i < datadetail.length; i++) {
                var latlng = new google.maps.LatLng(datadetail[i].Lat, datadetail[i].Long);

                var myOptions = {
                    content: labelText,
                    boxStyle: {
                        border: "none",
                        textAlign: "center",
                        fontSize: "10pt",
                        width: "50px"
                    },
                    disableAutoPan: true,
                    pixelOffset: new google.maps.Size(-25, -5),
                    position: latlng,
                    closeBoxURL: "",
                    isHidden: false,
                    pane: "floatPane",
                    enableEventPropagation: true
                };

                // Add circle overlay and bind to marker
                var circle = new google.maps.Circle({
                    map: map,
                    radius: 800, 
                    fillColor: fill_color_val,
                    strokeColor: '#69DAED',
                    strokeWeight: 2,
                    fillOpacity: 1,
                });

                var marker = new google.maps.Marker({
                    position: latlng,
                    title: datadetail[i].Author,
                    draggable: false,
                    map: map
                });
                marker.setVisible(false);

                circle.bindTo('center', marker, 'position');

                google.maps.event.addListener(circle, 'click', getInfoCallback(map, latlng));

                myOptions.content = datadetail[i].Count;
                var ibLabel = new InfoBox(myOptions);
                ibLabel.open(map);
                gmarkers.push(circle); 
                gmlist.push(marker); 
            }

        }
    }
        function getInfoCallback(map, latlng) {
            return function () {
                map.setZoom(15);
                map.setCenter(latlng);
            };
        }

        var data = [ ... ]; // Data Array

        var datadetail = [ ... ]; // Detail Data Array

        function ClearMapMaker() {
            console.log(gmlist);

            for (i = 0; i < gmlist.length; i++) {

                gmlist[i].setMap(null);
            }
            gmlist = [];
            console.log(gmarkers);
            for (i = 0; i < gmarkers.length; i++) {
                gmarkers[i].setOptions({ fillOpacity: 0, strokeOpacity: 0 });
                gmarkers[i].setMap(null);
            }
        }
</script>