What do hotels use to clean glass doors?

How Hotels Keep Glass Shower Doors Spotless (And What They Really Use)

If you've ever marveled at how hotels keep their glass shower doors crystal clear—free of water spots, soap scum, and grime—you're not alone. While many assume it’s some high-end, secret cleaning formula, the truth is both surprising and simple.

Some hotels, especially those looking for quick fixes on stubborn residue, have been known to reach for an unlikely hero: WD-40. Yes, the same product famous for silencing squeaky hinges can tackle tough stains on glass. When sprayed and left to sit for about fifteen minutes, WD-40 helps break down mineral deposits and soap buildup that regular cleaners often struggle with.

The process is straightforward: after letting the solution dwell, staff wipe it off with a microfiber cloth using circular motions. This technique lifts away residue without scratching the glass, leaving behind a streak-free shine. The oil-based formula helps displace moisture and grime in one go.

Still, it's important to note—while effective—WD-40 isn't the go-to for every hotel. Most prefer eco-friendly glass cleaners or vinegar-based solutions for routine maintenance. But when faced with years of accumulated film, a little WD-40 can be a powerful rescue step, followed by a thorough rinse to avoid any oily residue.

For home use, this trick can work wonders on neglected showers—just don’t overdo it. A light spray goes a long way. And always follow up with a clean water rinse and dry with a fresh microfiber cloth to avoid smudging. It’s not magic, but it’s close.