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Let’s face it: nothing ruins your day faster than spotting that stubborn yellow ring greeting you when you enter the bathroom. I used to rely on a frantic five‑minute scrub and crossed fingers—until a critical houseguest inspection convinced me to up my game. This isn’t a quick bowl scrub; I’m talking a full toilet transformation. If you’re staring at your seat and wondering “What even is that stain?” read on. First, understand what you’re battling: • Hard water deposits—those mineral rings from calcium and iron.• Urine splash‑back that wasn’t wiped up right away.• Mold and mildew thriving in every humid…