Nose troubles

Sophie has discovered her nose. She discovered it about 2 weeks ago, but now she's realized that there are holes in her nose! So she feels the need to stick her finger in her nose. She doesn't "pick" her nose, she just sticks her finger in a nostril and just kinda hangs out. To discourage this, I have started smacking her hand and saying "yucky", which she thinks is hilarious. How in the world are you supposed to tell an 11 month old that sticking your fingers up your nose is unsanitary?? Oh, the joys of parenthood.