If you prefer to avoid harsh acids, bio-enzymatic cleaners are an excellent alternative. These contain "good" bacteria that produce enzymes specifically designed to "eat" organic matter and uric salts.
A: Cola contains weak phosphoric acid, but it is too diluted (approx. 0.05% acid). It may work on very fresh stains but not on hardened crystals. You would need gallons of it. how to dissolve urine crystals in urinals
Dissolving urine crystals is not just about aesthetics. Crystal buildup harbors that release volatile organic compounds (VOCs). These compounds cause the characteristic "urine smell" that no amount of air freshener can mask. More importantly, biofilm inside crystal deposits can contain E. coli , Klebsiella , and other pathogens that become aerosolized when the urinal flushes. If you prefer to avoid harsh acids, bio-enzymatic