So I found out WindowHandler if Selenium which quite userful.
Simpley here is how I make it.
C#
public static void RemoveAdd()
{
    if (driver.WindowHandles.Count() > 1)
    {
        do
        {
         driver.SwitchTo().Window(driver.WindowHandles.Last());   
         driver.Close();   
         driver.SwitchTo().Window(driver.WindowHandles.Last());         
         } while (driver.WindowHandles.Count() > 1)         
     }
}
