The answer to 'natural window cleaning cleaner' is to use a simple mixture of water and vinegar. Mix equal parts white vinegar and water in a spray bottle, then spray the solution directly onto windows and wipe clean with a microfiber cloth or squeegee. This natural cleaner is effective at removing dirt, grease, and grime from windows without the use of harsh chemicals.
For best results, clean windows on an overcast day or in the shade to prevent the solution from drying too quickly. Avoid cleaning windows in direct sunlight. Reapply the vinegar-water solution as needed to keep your windows sparkling clean.