1. put the goblet into a jug of hot water, but do not struck
the water
2. make sure wiping cloth cover the top of the jug
3. after around 30 second pull out the goblet and you will
see the goblet full with water vapor
4. wipe the inner side of the goblet but make sure the
finger do not touch the goblet
5. repeat the step with other glassware
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