I'm taking out a giant ivy because it's just too much to control any more these days. I have one patch near the main stem that looks like it'll be particularly hard to remove - it's those suckery tiny finger things. The wall is in excellent condition, ivy aside. What are the best ways to tackle the leftover bits? I don't want to wait a year or three to watch it weather-off. For reference, the wall is north facing. Do you think a jet-wash would be ok? I'm also wondering about sandpaper but obviously would have to be careful. The bricks are not soft.