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there are glass polishes. I haven't used it but I hear good things about diamondite. look them up, they have a lot of products for glass. There is also a cheaper brand called One Grand Products and their cleaner is usually $15
i've used wax, a clay bar, and CLR on a rag to remove them. if they aren't severe then wax, if wax won't hit it the clay bar and if you throw everything you have under the sink at it then use CLR....