A dish soap solution makes a powerful DIY window cleaner that cuts through grime without leaving streaks. Avoid cleaning windows in direct sunlight and be sure to use clean tools to avoid streaks.

Pro cleaners reveal the simple, streak‑free method for washing windows—and the common mistakes that make them look worse.

Peruse the cleaning section of a big-box store, and you’ll find potions and gadgets to polish and scrub every cranny of your home. But housekeeping experts say you can clean many places with one ...