Quickly remove traces of ivy

efeu hauswand vorher

After cutting back or removing the ivy, do you have these grey stains and remnants of aerial roots on the plaster? These are traces of ivy. Or ivy stains. Call them what you like. But… how do I remove them? What can you read? Wire brushes, expensive miracle products or painting over are supposed to help against ivy stains. I’m sure that’s all true. But there is also a cheap trick for it! Really cheap! Really quick!