In article , Mark i@dontget
lotsofspamanymore.net writes

Apart from replacing the whole rail is there a simple/easy solution to
this?

Spray the rail with a silicone furniture polish, such as Mr Sheen. Run
curtains back and forth a few times, they'll be much improved.

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(='.'=) Bunny says Windows 7 is Vi$ta reloaded.
(")_(") http://imgs.xkcd.com/comics/windows_7.png