Window cleaning does not require special tools or solvents. A commercial household cleaner can be used to clean casement windows. It is important, but often overlooked, to remove any dust and dirt from the glass and frame using a dry paintbrush or lint free cloth. Then you can clean it with a liquid solution. Prewash grimy glass with water and a little dishwashing soap. Spray the glass with a cleaner.
Some homeowners prefer natural cleaners over chemical-based ones. It is possible to make your own glass cleaner at your home using 50% vinegar and 50% tapwater in a spray bottle.
For a cleaner look, newspaper can be used in place of paper towels for window cleaning. Because they are made of dense fibers, they are less likely to separate or cause lint. Some paper towels can have a coating that feels nice, but may leave streaks on some types of coated glass. To avoid streaking, no matter what method you use, dry the glass well.
If you are installing on an upper level, consider purchasing in-swing casement Windows.
Casement windows can either be installed to swing in your home (in-swing) or outwards in your yard (outward-swing). Cleaning will be easy if the window is at an accessible height.
Swinging inwards is a great way to simplify cleaning difficult-to-reach windows.