Professional Window Cleaning Services Corp's technicians use a bit of science to help them clean windows safely—both for themselves and the environment. Rather than scaling ladders and wielding soapy squeegees to scrub at accumulated dirt, they use purified water with a total dissolved solids (TDS) reading of zero.

Confused? Don't be. All this means is that they remove every molecule of mineral from the water, making the water eager to absorb more once again. They then spray this super-pure water at windows with a pressurized hose, quickly dissolving dirt and removing stains without scratching the glass. The best part? They don't even need to wipe down the windows afterwards, since the water doesn't leave behind any mineral deposits or ominous threats of "I know what u did."