Besides the smell, which my wife does not appreciate, I really didn't have an opinion one way or the other as it seemed to work OK but not really any better than the generic blue wiper fluid. But when winter blew in, my opinion went from "OK" to "Prestone, what the HECK were you thinking????" I now have three cars with windshield reservoirs with frozen and unusable slush. Apparently Prestone saves money by not formulating the bug wash with anti-freeze and it froze on me - creating a challenging and dangerous situation.I WILL NEVER BUY BUG WASH AGAIN!!!!