We have a black walnut tree and there is nothing that takes it off. We have tracked them in on our beigh carpet and it is there to stay. We don't use the nuts, the squirrels get them all, that I don't pick up. They are a messy tree but it is such a big beautiful tree, I hate to cut it down. My husband has threatened for years to chop it down, but I wont let him. He really hates the tree and I am about to give in to letting him get it cut. It is so messy.