Magic Window Cleaner- 1Tbsp. Jet Dry, 3Tbsp. Dawn 2 cups water. Mix and place in a spray bottle. Wet your windows, and spray. Scrub with a sponge, and rinse with cold water. No need to dry! Sounds great for the outside windows.
Cleaning Hack: How to Have Spotless Windows for Months
Add more daylight to your flat roof room with flat glass rooflights. These windows are designed to maximise the amount of natural daylight your room, and provide a clean minimalistic finish both inside and outside.