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Apple says sweat, water and dust resistance are not permanent conditions and can diminish over time, and its own IPX4 models are not meant for the shower. The rating is a lab classification; the warranty is a separate document.
Steam mops clean sealed tile with nothing but hot water. On hardwood and laminate, heat and moisture work into seams and finishes, and wood flooring makers say not to use them.
Flat-pack furniture is cheap because particleboard is cheap. It holds up well in dry rooms, but swells where water reaches bare edges and loosens every time it is dismantled.
Rug fibers fail in different ways: viscose marks and weakens when wet, polypropylene flattens in traffic, and wool sheds loose fibers at first. The label tells you which you are buying.
Meters on a watch dial describe test pressure, not how deep you can take it. Age, heat, soap and a pulled-out crown can defeat the rating long before any depth does.
