I had one of your Wallflowers start leaking Brown sticky stuff out of the side. It was pretty gross but when I took it into the store they said that was normal when it gets old which is very weird. Plus the plug-in was only under a year old. So that doesn't make any sense that that's what happens when they get old. They shouldn't have a expiration date. If they do it should be on the package because they are not cheap. The girl just said that was policy and there was nothing they could do. I will be switching to a different plug-in from now on. I was very disappointed in your store. That is horrible customer service.