Hi guys, I’ve got an old Coleman metal flask which I like as it’s sturdy and has good capacity.
But mainly because I can’t break it, as I always do with the glass ones.
The problem is there’s a real residue of coffee staining and sludge on it now, inside, that doesn’t give the coffee the best taste.
Now, I know a day or two soaking with diluted bleach would zap it clean, but the problem with that (I’ve found from experience) is I’ll probably be able to taste bleach for the next several trips.
I’m not worried about it being harmful in that quantity, but bleached coffee isn’t my first choice of drink!
Any alternative suggestions for a cleaning agent? Baking soda maybe? I’ve never used the stuff but heard it can clean?