You should clean between compunds for this reason. You have spent the time to get the desired effect with the current compound you are using, so you clean it and start with a less abrasive compund. You don't want to get cross contamination and when your finishing up the last bit of polishing you hit some of the emory compund you used and dull it up, step backwards. That is the reason, clean the metal of all the compund and "stuck" metal from the polished surface, so your next compund has a clean surface to work with. Plus it lets you see your results easier at times.
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