try using a soldering iron to warm the filler to soften it to get it off using a tough wire brush.
It worked for me and it's a good way cos you can aim the heat very accurately where you want it,
rather than blast the whole area as you would with a blow torch and degrade the aluminium.
Thanks for the tip mate but it's fine - I've dropped it off to a 'professional' to do :-)
Thanks for the tip mate but it's fine - I've dropped it off to a 'professional' to do :-)