Unless you don't mind having a big scratch mark worn into your front window get rid of that tank cover ASAP. It happened to ours right after we got it. If you can come up with a way to keep the cover from bouncing and jiggling around so it won't contact the window please post it here. There were other owners with the same problem. HiLo gave us a new window and a fiberglass tank cover, just before they shut down the business.