How to clean thermos flask or vacuum flask

I have seen many people love to use thermos flask and similar thermos containers, but they really hate to clean the thermos container they just used. So, to help all such users of thermos flask or lunch box, here is a tip to make the job of washing thermos flask easy.
There is no secret ingredient to make the washing easy, but there is a secret way which I use to clean thermos flask easily. All you need to do is described here in  simple steps:

• Prepare a soap solution with some vinegar.
• Pour it into your thermos flask you wish to clean.
• Keep it the same way for say 30 minutes.
• Now, remove some of the liquid from bottle to make it half filled.
• Shake the bottle well for 2 minutes.
• Use a bottle brush to clean the vacuum flask.
• Empty the flask.
• Use a soft cotton cloth and push it into the flask from one corner and holding another corner outside.
• Use a spoon / fork to rotate the cloth which has gone inside the flask.
• Now your flask is clean and keep it open for few minutes to dry if there is any water content remaining.

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