1. Mix jointly a solution of 1 and half distill water and 1 and half rubbing alcohol (70%).
2. Pour the combination into a travel-sized spray bottle. Use a funnel to avoid dropping.
3. Trace the base of the bottle on a soft cloth with a sharpie and cut out the circle.
4. Fix the microfiber circle to the bottom of the spray bottle with a little velcro square.
5. Voilà! Go employ your spray bottle plus built-in wiper on a unclean cell phone otherwise laptop screen.