Washing stains off?

my pre-teen son needs me to wash some pee stains out of his undies. What is the best product to use to get the job done?Washing stains off?
An enzymatic cleaner or Oxyclean or the like will help. Shout or Out or any of those prewash treatments will work too. So will bleach.Washing stains off?
Try soaking them in some Borax and in the final rinse add a cup of white vinegar to neutralize the odor.:)

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