I have an 11-87. I have used both breakfree, and hoppes #9 as a solvent and rem oil or hoppes advanced for the lube and protect. I think either will work fine for you. I felt like the CLP wasn't strong enough solvent to get the junk out of the gas system, but that's not a problem with your 870. Unless you notice a problem, I say stick with what you know.
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Cheers,
Dave
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