There is no such thing as "benign" neglect.
Clean your firearms immediately after use.
The crud that collects attracts moisture (humidity) leading to the formation of acids. Over time, if "neglected", these will eat away at the bore causing severe pitting. This may be of less concern with shotguns than rifles or handguns, but it is good practice nonetheless for ALL firearms. Keep them well maintained at all times, and safely stored when not in use.
Every firearm you own should ALWAYS have a light coating of lubricant - mine being good old CLP.