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I have used oven cleaner spray when the pipe was hot, let it soak for 5 min, then scrape off with a nikel coin. It is a softer metal than chrome and did not scratch my pipe.
Bad news is I�ve seen this type of incident and there is no getting it off completely.
Use the nickel as a scraper and you will get it off completely. Spray it first with a liquid to make it go easier, I think I used Meguiar's Quick Detailer. It may take you several minutes, but it works.
Steel wool, no matter how fine, will scratch the chrome on Harley pipes...and no polish will take those scratches out.
I touched the inner lining of a jacket to my chrome lafranconis and steel wool took it righ off, no scratches. But they aren�t Mexican made Harley pipes either