Illustration by Sean Gallagher. "Somebody still uses you MS-DOS" Asks: I found an old stainess steel flask that someone once gave me. I want to use it again to hold whiskey. There doesn't seem to ...

It started to work immediately, and in 30 minutes, the inside was as clean and shiny as a new one would be. I have bought several thermoses since that time and cleaned them the same way.

Thermos Cleaning Hack: Recently, we came across a viral hack on social media that shows how to remove bad odours from your thermos in just minutes.