To clean a vacuum flask, fill it threequarters full of warm water, drop in half a teaspoonful' of bicarbonate of soda, and shake the flask (with the cork in) as hard as you can for a few minutes.
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Otago Daily Times, Issue 23831, 10 June 1939, Page 27
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38Page 27 Advertisements Column 3 Otago Daily Times, Issue 23831, 10 June 1939, Page 27
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