Posted: 29/07/2014 at 12:39
No problem we had a similar problem where we used to live with ground elder coming in from our elderly neighbour's garden, be thankful you've just got Virginia Creeper!
Just be careful if there's a breeze though as it can get blown onto plants you want to keep. If it is windy put a bag over the bit you want to spray and spray inside. The plastic should speed up the take up process as well.