If you put too strong a mix of TFR on glass, this is only likely to happen with a strong caustic cleaner such as Virosol, you’ll know if it’s self cleaning as it turns the glass milky in appearance.
Just apply a solution of descaler to the glass. It clears immediately. Don’t ask me why or how, or what the science is behind it, but that’s the solution. Any other general purpose TFR, you’ll likely not have an issue.