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Use silicone based spray. Halfords and diy places sell various types of "silicone" spray for various uses.
Don't use too much though otherwise you will get grease all over the windows & trim.
As your car is a 2004 model it will still have a warranty, if you are not happy with the operation of the windows ask your dealer to have a look. Especially if the silicone spray doesn't help.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.