doesn't remove or empty array on listener after change route

Hi,
I defined a service like this:
```
'use strict';

app.factory('mySocket', function(socketFactory) {
return socketFactory({
ioSocket: io.connect(':3001',{forceNew: true})
});
});
```

and in controller:
```
app.controller('ChatCtrl',function($scope, mySocket,$rootScope) {
$scope.arr = [];
$scope.arr.length = 0;
$scope.currentChannel = 1;

Restangular.all('chat/message/').getList().then(function (data) {
$scope.arr[$scope.currentChannel] =data;

mySocket.on('connect', function () {
console.log('CONNECT');

mySocket.on('messages.new', function (data) {
var tmp = data;
tmp.timestamp = data.timestamp.date;
$scope.arr[data.thread].push(tmp);
})
})
```
when I refresh page all things is okay, but when I switch to another page and come back to chat page `$scope.arr` not null and last data array in listener is exist.

What should I do for null array after come back to chat page (just on listener block)?