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The presence of the healthy microbiome, the [[Langerhans cells]], and the lytics in the sub-preputial moisture give the preputial sac strong immunological functions. [[Circumcision]] destroys the preputial sac and its protective immunological functions and makes the patient more vulnerable to [[infection]] throughout life.<ref name="fleiss1998" />
One frequently hears the advice to wash the preputial sac at least daily to prevent [[infection]]. This advice is outmoded.<ref name="fleiss1998" /> <ref name="birley1993" /> Washing may introduce pathogens into the preputial cavity. It also removes the skin oil and protective lytic substances described above. It is better to wash only as necessary, using only warm water.
If the [[foreskin]] is non-retractable, then a rubber-bulb ear syringe may be used to squirt warm water into the [[foreskin]] to flush it out for an occasional washing. Washing is recommended before and after sex and as desired to remove accumulated [[smegma]].