A previous owner obviously had some issues before me and had had a go at a DIY repair..

It seems as though it had previously come off and its been stuck back on with a massive blob of what seems like araldite or other really strong glue so the sensors don't touch the windscreen,
How can I remove these blobs of glue without damaging or breaking my windscreen??? They're rock solid and quite big,
If I can do this then I can fit a replacement....
Any help would be greatly appreciated....
