Only plain water for Cleaning Windows

I use diluted screenwash from a spray bottle. Spread with a sponge, squeegee off and polish any streaks with newspaper.

If you ever watch any serious NASCAR racing, you might occasionally see a pit stop where a long stick appears over the pit wall, and on the end of the stick is a bit of rag or sponge which is used to clear the windscreen.

Allegedly its soaked in Coca Cola, but "other brands are available" ...

If using water you want deionised water. I have a reverse osmosis filter system that can output about 25litres in 8 hours.

For cleaning my house windows I will use a garden hose connected to a brush to get the dirt from the windows. If I leave them to dry just using this the minerals etc. in the water will be left as spots/streaks on the glass. What I then do is use a garden sprayer filled with my filtered water to thoroughly wash away the tap water. Result a perfectly clean window with no streaks or spots , andhaving to use a squeegy.

For inside glass or mirrors I use a spray mister to cover the glass in the filtered water and then a paper towel to rub out any dirt spots. A further spay of filtered water and a quick rub over with the towels and left to dry. The glass can be left with a small amount of water still o them.

If the glass is greasy or very dirty then it needs a pre-wash (tap water with a detergent) followed by a flush with the filtered water.

The problem I've found with car glass is that there is always a film of (road) dirt/exhaust/etc. that often cannot just be cleaned with just water. I still use my filtered water as a final application. What I have found very useful is a windscreen microfibre cloth on a stick similar to