But being a clear glass jug, I could see the dark build up on the base of the jug that is conveniently hidden from casual sight in a metal or plastic jug. I opened the top a few times and had a bit of a scrub but it didn't seem to work and I was reluctant to use more than detergent in it as I drink out of that jug regularly and wasn't keen on poisoning myself with oven cleaner with my next cup of tea.
Then I recalled reading something about using citric acid to clean out the build up in your jug and thought I would give it a go one afternoon.
Here's what I did...
First I dug out my container of citric acid (available in the baking isle along with baking powder and tartaric acid in the supermarket for around the $3 mark)
I popped a decent tablespoon into a litre of water and went to get my camera.
By the time I got back - a whole 30 seconds - the jug was just starting to simmer and the mark was completely gone!
So in my experience its a quick and easy method and I'm annoyed that it was so quick as I don't have a before photo to show you! I thought it would take a few minutes of boiling and I didn't see anything between big brown mark on the bottom of the jug and bright shiny bottom of the jug!
Green-ness: 5/5 for using a more natural chemical to clean things with!
Frugal-ness: Another use for citric acid that makes the $3 well worth it
Time cost: Much less than I had anticipated!
Skill level: Speed photography - or even just the camera to hand if you want to record this amazingly quick process!
Fun-ness: Its nice to see the shiny bottom of the jug again!