Been using this for around a week. It stopped the jets from freezing and the water on the glass. Anyways I collected money last night and four customers noted how shiny the window are. So today I used it again. Checked back and I have never ever seen a shine like this. I have read up on it and it does make sense why it would leave a shine. As anybody noticed this, any info on it. I am keen to use this all the time tbh.