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Agreed. Recommend wet sanding as well. Start at 600 and put in a good hour getting the rust off. If you find that the 600 is not getting the job done you may nedd to drop down to 400 grit. Here...

I would recommend giving hand sanding a shot before hitting it with a dremel. At least for me I have much better control. Easier to mess up the blade with power tooling. Just my 2 cents, other...