Some of the dirt will be soaked and stick on the paper towels.
Repeat this procedure 2-3 times.
Now rinse the mirror with more of the distilled water with detergent.
Then wipe with a wet micro fibre cloth or a cotton cloth from top to bottom. Try not to apply any pressure.
Now wash the mirror with pure distilled water to remove the residuals of the detergent.
Again wipe from top to bottom.
Now spray pure isopropanol onto the mirror. The alcohol flows down, takes the residual water with it and dries
without leaving droplets on the mirror surface.
Let the mirror dry.