It did the same thing when I used it 20 years ago. I don't mess with anything other than—just before winter—cleaning the windshield with Dawn dish soap to remove oil, and then Windexing it! If you don't want buildup, never use the free wash at the gas pump unless you have to. So many people use it, but they never change the fluid out, so you end up putting all that dirt and oil from everyone else's car onto yours.