Once complete, you’ll need to follow this up by using the cleaning solution, but make sure you check the packaging for more details. Most of these will need to be diluted and added to a bowl with water. When you’re wiping the windows, use a clean sponge and really put some elbow grease into it so any resilient marks come away.
The key to a crystal clear window is removing watermarks when the process is complete, and that means using a squeegee. These can be purchased in most supermarkets, but again this item should be 100% clean before you start using it. If the weather is nice, it could be best to get the outside cleaned first, then you can repeat the process in the inside.
Window cleaning requires attention to detail, especially if you want the job done correctly, and it’s a task that needs doing every month or so, otherwise grime will soon start to build up.