Remove markers from google maps iOS

I am building an iOS app using storyboards and Google Maps. Using iOS6 My application features the split view navigation as seen in the facebook app On my left view I am selecting an item in a list which has lat/long cords and showing it on my map on the following method `- (void)viewWillAppear:(BOOL)animated` I would like to remove all markers in this method before I add another one (so only one marker is on the map), is there a way to do this? Below is my code to add a marker to the mapView Thanks in advance - Jon ``` - (void)loadView { GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:poi.lat longitude:poi.lon zoom:15]; mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera]; mapView.myLocationEnabled = YES; self.view = mapView; mapView.mapType = kGMSTypeHybrid; //Allows you to tap a marker and have camera pan to it mapView.delegate = self; } -(void)viewWillAppear:(BOOL)animated { GMSMarkerOptions *options = [[GMSMarkerOptions alloc] init]; options.position = CLLocationCoordinate2DMake(poi.lat, poi.lon); options.title = poi.title; options.snippet = poi.description; options.icon = [UIImage imageNamed:@"flag-red.png"]; [mapView addMarkerWithOptions:options]; [mapView animateToLocation:options.position]; [mapView animateToBearing:0]; [mapView animateToViewingAngle:0]; } ```