Removing controls from a form

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VB

I have just realised that if I delete a control from a form (ie label, textbox etc) the supplimentry lines that vb adds to the form designer.vb file are not cleaned out automatically.

But I have been reading that you can get vb.net to clean up after itself, but all I have read leaves me rather confused and it has sometrhing to do with this code

'Form overrides dispose to clean up the component list.
 <System.Diagnostics.DebuggerNonUserCode()> _
 Protected Overrides Sub Dispose(ByVal disposing As Boolean)
     Try
         If disposing AndAlso components IsNot Nothing Then
             components.Dispose()
         End If
     Finally
         MyBase.Dispose(disposing)
     End Try

Do I put a call somewhere in the VB?

Do I call it somehow off-line?