You'll be cleaning a lot with a non chrome lined barrel like the OPs 870. Denatured alcohol is your friend like William said. You can buy it by the gallon at a hardware store , and it's much more economical than a solvent . Personally I shoot 3 times between cleanings. That's just what I do. Second shot is always the best pattern typically . Don't know why , but that's my 870. I do still use solvent on final cleanings . But I always follow up with alcohol to cut out any remaining oils from the solvent .