If you can’t loosen it, use a crescent wrench or adjustable wrench. Then, grab a second crescent wrench or channel lock and secure it to the shower arm. Out of curiosity, I did some research and found a few interesting facts about shower head heights. A CU Boulder study showed that bacteria found in showers is resistant to chlorine-based cleaners like bleach. Fixed spray heads work like a shower nozzle, sending out a fan-shaped spray.