Has anyone tried urine on acne??

My little sis has horible acne and I'm at wits end trying to help her. Shes been hearing alot from my grandmother that urine can cure it. No negative comments please. Im curious has anyone tried it and how did you use it. Please explain in detail.
Update: Im only asking those with prior experience, besides urine is sterile. My sister and I are both past the gross factor. Dermatolagists want your money and are extremely expensive. Over the counter is no longer an option for her so please...respond ONLY if you have experience. Thanks in advance.
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