Theres only one way and thats the long slow process of removing it piece by piece, from the top down. My garage originally had so much ivy covering the shell that it had actually started to crush and distort the panels (concrete prefab)
I have some ivy infested with some kind of insect that is killing it (see "Ivy mite" in Gardening.
I can send you some if you send me an SAE (put your email address in your profile).I noticed last week that it seems to be eating the fresh growth on the tips.
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