Have ruined my iron with bondaweb?

Hi there,

I was ironing a project and didn't realise the material I was using had remnants of bondaweb on it!

It's a real mess and I've tried everything...

vinegar
bicarbonate of soda and baking power
white spirit
and a special iron cleaning stick from Robert Dyas

Any suggestions before I give in and buy a new one?

Thanks,
Lucy Elizabeth

PS: the really anoying thing is that I have an old iron for projects of this nature but of course I thought I was just ironing plain cotton, arrghhhhh!