First line of defense is soap and water.

Clean water applied with some force from a syringe goes a long way toward washing dirt and germs out of a wound. Rinse, or blast away, the dirt and germs and you don't need much disinfection.

An iodine or dilute bleach solution can work well but you need to watch the duration and strength because most things that will kill or inactivate germs will also damage healthy tissue. And damaged tissue is a good place for infections to get a serious foothold.

An interesting alternative that has been used is honey. Honey is intensely hydroscopic so it tends to dry out and inactivate bacteria while being relatively gentle to the surrounding tissue. The few small studies used a mix of honey and povidone iodine and they seemed to show some success in stopping the infection and speeding healing in otherwise difficult infections.