How to clean a vacuum thermosflask

A vacuum thermos flask can be easily cleaned without much effort using these methods. Method 1 of 4: Tea Method Hang one or two teabags in the flask. Pour boiling water in the flask, fill up completely. Screw the cap on. Let it sit overnight. Pour tea out of the flask. Rinse flask with clear water.   … More How to clean a vacuum thermosflask

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