I have some very old and well established ivy growing up a a very old
outbuilding.

I want it gone. Mechanical means (ie., a mattock) would damage the old
brick work. Round-up is not effective on the glossy leaves.

I'm looking for a chemical warfare answer. The ground is just shingle and
part of the drive. In previous years a dose of sodium chlorate would have
done the job but is no longer readily available.

Any ideaas?

mark