I never get any of it, I do take a shower everyday
but after you take a piss pull the foreskin back little bit so. your urethra is exposed, once you're done wipe it with the toilet paper or your underwear, then cover it with your foreskin again, once its dry and clean under it , it should be fine
and after you ejaculate , if you leave the foreskin back on, then remaining sperm will come out from your penis, resulting it being trapped under it, saying your foreskin covers your penis entirely,
if it still happens otherwise, just take a shower often, once a day like we all do, or twice a day if you want, morning and evening - that's every 12 hours.
I personally wish I could get those , so I can lick it off, I like how it smells nasty