surfingboye said...
boiling hot water, and then spray a little bit of milk onto the zip.
100% success rate.
give it a try.
I've also heard this works.
Otherwise you might have to get a pair of pliers onto it and pull it firmly. A few taps with a hammer can sometimes loosen the oxidised parts. Once corrosion sets in you have real problems. If all else fails buy a new bag with a nylon zipper.
