Having recently spent some time applying Carlack for this years application, I can whole heartedly recommend it
It has lasted nearly a full year on my car with only the windscreen showing signs of it wearing off. It comes in two bottle a cleaner and the sealant. Now I am going to be honest here its a PITA to get the cleaner off. It applys like a wax and then you have to buff it off. The next step is the sealer and its just as awkward.......BUT it is really worth the effort.
If you are still not convinced, look at this video.....you find that you dont really need wipers