A glass cleaner made of pure water would work, if you really want to save time and money.
But for a perfect result with less effort, you can test this recipe!
This glass cleaner contains just the necessary ingredients:
- Water and vinegar dissolve the dirt and scale.
- Alcohol sanitizes the surface (strong antiseptic action), and facilitates the product evaporation, for a clear and shiny finish!
Reuse an old spray (chose the ones that can be opened, some are sealed!) forever =)
Sprayed it on the surface to clean, and wipe with a classic towel. Any towel will work, but micro-fiber sheet will better fix the dust and impurities.
Precaution: Use gloves in order to protect the hands from the drying effect of alcohol.