I use Invisible Glass and works fine for me. Did not work and was ready to throw this one too, until a detailing guy told me that most of the solutions work fine. It is the cloth that you are using that matters. He gave me 10 cloths like that and since them I am a happy guy.
Still need to clean it on a weekly - 2 weeks basis.
If you are a smoker, use the AC and so on, things get foggy pretty soon so you might need to do it more often.
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