Detecting mildew in the shower is crucial for maintaining a clean and healthy bathroom. Mildew appears as patchy, uneven discoloration—often grayish, greenish, or blackish—especially along grout lines, corners, and under sink edges where moisture lingers. Unlike soap scum, which washes away easily, mildew clings stubbornly with a fuzzy or powdery texture that may feel slimy when touched. It frequently develops in poorly ventilated areas, thriving in the persistent dampness typical of shower environments. Early detection not only helps prevent costly repairs but also reduces health risks linked to mold exposure. Regular cleaning and improved airflow are essential to keeping mildew at bay. If you notice persistent stains or musty odors, act quickly—your shower’s appearance and safety depend on timely action.