Dawson's New Favorite Toy

We like keep a piece of PVC pipe in the window track of our sliding glass door for an added safety measure, but it doesn't stay in the window track. Why? Because Dawson discovered it and now it is like some hidden treasure that he has to always go and pull out and play with. At first I would say no and put it back and redirect his attention but he got smart and stopped buying it. So, Dawson pretty much won this one. I try to keep the window track clean, not think about the dirt, make sure he doesn't stick it in his mouth, and let him go about his fun. Maybe the novelty will wear off right??