One last thing
If, after adopting a more thorough washing and drying routine, using an absorbent powder and switching to a different style of undergarment, you're still experiencing a problem with testicular odor, go see a doctor. There's probably nothing major wrong with you, but you may have developed a fungal infection and you should get that checked out.
Fungal infections, despite how gnarly they sound, can be treated quite easily, so go get it dealt with. Your balls will thank you.
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Jolie Kerr is a cleaning expert who, despite not having a set of balls herself, spends a lot of time thinking about how to properly care for them. Follow her: @joliekerr.