Sorry to ask such a dull question but this one really defeats me. I am thinking particularly of the soles of white socks. How do you get those looking whiter than white (or I would settle for roughly clean looking). I know the first step would be to not allow my children to go outside with only socks on (no shoes) but given that the odd one slips past me from time to time, what should I do to clean the socks? I find 40 degrees Centigrade doesn't do much, and I have used all sorts of stain removers and detergents. Could I wash them at 60 without shrinking them? Would that do it? Do you have any other secret remedy? Thanks.