How to clean a narrow vase

...or any vase with 3 simple ingredients.

All you need are 2 tea spoons of uncooked rice, 1 tea spoon of salt (rock salt works better but any salt will do) and a little bit of water to help the rice and salt move (about 2 table spoons).
For limescale removal use vinegar instead of water.

Swirl until clean and rinse. Repeat if needed.

And voilá!