How to reduce the build up of smegma?

Smegma is a totally waste product composed of used body oils, shed skin cells, dirt, etc. It is constantly produced under a foreskin and quickly attracts adverse bacteria which find it a fine nutrient bed in which to multiply. In the process of doing so they emit an objectionable smell.

Your first line of defence is to ensure that you wash your penis properly with soapy water at least daily (for which you must fully retract your foreskin). Washing more frequently (including when showering after gym, sport or swimming) will help even more.

However, the only way to eliminate the smegma and the smell resulting from it is the simple external procedure of circumcision. This can be done at any age under local anaesthetic in a doctor's office. You would never regret getting it done as it has been proven to provide a lifetime of health and sexual benefits with no drawbacks.

A damp finger occasionally.

proper hygine

A cursory overview of your past questions is suggestive of trolling.

clean better or see your doctor

Ignore the American circumcision troll. There shouldn't be any. Never met anyone with it and only happens to people who don't wash properly

circumcision.

no one wants to have sex with guys with stinky cheesy uncircumcised d!ck.

uncircumcised guys have many issues like tight foreskin, bad smell, smegma and higher chance of transmitting STDs.

no wonder girls are turned off by foreskin right?

By washing yourself daily.