How to unscrew the cap of a whiteboard marker easily

Sometimes you will find that the cap of a whiteboard marker is too tight to unscrewed for refilling of ink. Well, I will teach you a very simple way to overcome this problem.

The difficulty in taking off the cap is the slippery grip. Here is where a rubber comes in handy. Take a rubber band and put it round the edge of the cap. Now you can unscrew the cap effortlessly as the friction between the rubber band and the cap does the work while you are turning the cap anti-clockwise to move the cap and it comes out easily.

You have to try it to believe me. Good luck.