I don’t think multi-quote is working still, so for those who said use mineral oil/baby oil - I tried that once. Exactly once. Never again. Mineral oil is not water-soluble, and it attracted more dirt than I cleaned out in the first place! The warm, moist sheath environment turned it into a sticky gunky mess up there, and rinsing numerous times did nothing since the oil isn’t water-soluble! Completely nasty.
And in regards to the bean - yes I do check, but I’ve only ever found the tiniest little chunk in there and I’ve had him for coming on 6 years. He does tend to accumulate smegma in the sheath but doesn’t grow much of a bean.