Flask used to store hot water often leave the scale on the inside. Crust that settles in a long time is difficult to remove and will not be lost if only washed in the usual manner. But do not discard flask first, because there is an easy way to remove stubborn crust on the inside of the flask. Using White Rice: Enter a fistful of white rice into a flask, then pour in hot water (but not to full). Close tightly and shake the flask until a couple of times.
Discard the water in a thermos. Perform up to 2-3 times longer new flask wash as usual. Using Lime: Squeeze 2 lime fruit and put water into a thermos. Pour hot water into the flask until all parts exposed to water in a thermos. Wait until an hour or more, then wash as usual thermos. This method can be used when the flask is large and difficult to shake when using white rice. Any way you choose, stubborn crust on the inside of the flask will be lost. Good luck!
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