Tried-and-tested methods to leave windows smudge-free involve common household items, bespoke tools, and timing your window ...
Don’t be fooled by products that say you can squirt them on your glass and magic happens. Mechanical agitation is part of cleaning anything. Your body is cleaned in the shower by rubbing your skin.
Emma Morris uses water with a little detergent and also a dry microfibre cloth. "Go over the window with the soft side of the squeegee, squeegee it off with the rubber side, and the microfibre cloth ...
If you live in an area with hard water, consider using distilled water to make a DIY glass cleaner. By the way, the vinegar ...