She's a squealer..

Have started getting this annoying disc squeal from the front brakes on the ZRX. Every time I stop the girl she's like eeeoieeeoieeeoi from about 15kmh to 0kmh and it's driving me mad.
Started out of the blue when the pads were pretty worn so I just thought "no prob" throw a new set in....did this but it continued!!!
Caused by pad vibration if the net info looked at is correct and so far have chamfered the pad edges with a file to make them less square (something I read would help) and cleaned the discs with brakecleaner (about 5 times!) but it's still doing it.
Any experiences or ideas?

Started out of the blue when the pads were pretty worn so I just thought "no prob" throw a new set in....did this but it continued!!!
Caused by pad vibration if the net info looked at is correct and so far have chamfered the pad edges with a file to make them less square (something I read would help) and cleaned the discs with brakecleaner (about 5 times!) but it's still doing it.

Any experiences or ideas?