We all know about the wind noise from the ibiza coming from both windows, here is how i fixed it
I bought some plain black rubber car mats from Asda (set of 4)
Cut a long strip about 0.5 inch in width of each mat from the edge of each mat
put both your windows down (3 door ibiza)
Next using a pencil or anything long and not sharp

Pull back the fabric like material going verticaly and horizontally across the window and place the rubber strip behind this ensuring it is flat down. If the fabric starts to buldge out then the rubber strip you have cut is too thick and will need cutting down abit.
If should fit in the open space neatly and perfectly and is completly hidden from view.
Both windows still work fine and do not catch on the rubber at all. Rubber was used as it is flexiable, easy to cut, and wont absorb water like the black fabric i used before.
I have noticed massive improvements, and no longer need my music high to avoid hearing a realy annoying whistle like sound.
I belive it works by preventing the air from getting in the gap and causing alot of noise.
Please note - you dont have to buy rubber car mats, just any rubber will do, i just happaned to have a unused set lying about and suddenly fought of this idea
Hope this is of some use to someone
P.S takes about 10 minutes max to complete, very easy job with nothing to go wrong.

I bought some plain black rubber car mats from Asda (set of 4)
Cut a long strip about 0.5 inch in width of each mat from the edge of each mat
put both your windows down (3 door ibiza)
Next using a pencil or anything long and not sharp
Pull back the fabric like material going verticaly and horizontally across the window and place the rubber strip behind this ensuring it is flat down. If the fabric starts to buldge out then the rubber strip you have cut is too thick and will need cutting down abit.
If should fit in the open space neatly and perfectly and is completly hidden from view.
Both windows still work fine and do not catch on the rubber at all. Rubber was used as it is flexiable, easy to cut, and wont absorb water like the black fabric i used before.
I have noticed massive improvements, and no longer need my music high to avoid hearing a realy annoying whistle like sound.
I belive it works by preventing the air from getting in the gap and causing alot of noise.
Please note - you dont have to buy rubber car mats, just any rubber will do, i just happaned to have a unused set lying about and suddenly fought of this idea
Hope this is of some use to someone
P.S takes about 10 minutes max to complete, very easy job with nothing to go wrong.