That cloudy white haze covering your shower glass isn't dirt, grime, or evidence of inadequate cleaning. It's limestone, deposited molecule by molecule through thousands of shower cycles, now bonded to the glass with chemistry that laughs at your spray bottle. Standard bathroom cleaners target soap scum and body oils; hard water deposits are minerals requiring completely different chemistry. You can scrub until your arm aches - the stains aren't budging through force alone. Here's what actually works.