Cleaning a thermos flask / regular bottle with plain old water every time, just wouldn’t do the trick. You’ll know that it needs a deeper cleansing, when the stains or the yellow / copper toned layer starts to appear. I will let you know two sure-shot techniques, to get the job done efficiently :
1) The mild method
This method is great for stainless steel products, like a thermos flask. I use one to store hot water since I make formula milk for my son, using that. Since it holds water for long periods, it’ll eventually develop a layer of yellowish gunk that needs cleaning out ASAP. Ok so, you will need :
● A handful of crushed eggshells &
● Water (room temperature should do)
Put the eggshells in the flask. Then add water in it until it’s 1/4th of the flask. Then put the lid on and shake it vigorously for about half a minute. Twist and turn it in every which way possible so that the eggshells can hit every nook and cranny. Then pour out the dirty water, fill with some more water and then wash the inside of the flask again. Job well done!
Before & after pic of the base of the thermos flask
2) The intense method
This method is for bottles (glass or Tupperware) and definitely not for stainless steel products (since it ‘s an abrasive method & might leave minute scratches). You will need :
● Sand* &
The method is same as before. Fill the bottle with a handful (or couple of handfuls) sand, water about 1/4th of the bottle and shake. Since we are using this method for intense stains, you’ll need to continue shaking for a longer time, say a minute or more. Wash out and see if anything remains. If yes, repeat the process.
Here is the Tupperware bottle that I use, to drink cumin water**. After a while, the bottle develops an intense stain and in this pic, actually I haven’t cleaned it out for quite a while… *shameful face*. For the purpose of this tutorial, I first cleaned the bottle using eggshells. You can see how much it removed, but still there is lots left, particularly in the curves of the bottle. The sand method removed it completely and has it looking brand new.
* Sand is literally available anywhere. But don’t use it directly for obvious reasons. First, ‘clean’ it. Lol. Wash it until the water runs clear. I go an extra step to make sure it’s super clean. I layer it on a flat surface and let it dry in the sun. After using it, I wash the dirty water away and keep washing this sand until water runs clear again. Then, I dry this sand and store it in a container so that I have ‘clean’ sand available, whenever I need to clean a bottle.
** Cumin water aids in digestion, provides antioxidants by fighting free radicals & also removes toxins from the body. To make it, just boil some cumin seeds in water, until the water becomes a medium strength yellow (dark yellow means you added too much cumin than required). Strain and drink. An additional tip is that, if you crush (not powder) the cumin seeds, you will need to use only a less amount of it, to get the same color / results.
Also, just wanted to mention that if you are not able to get rid of the stain using any of these 2 methods, here might be the reason for it :
● you didn’t add enough eggshells / sand
● you added too much water
● you didn’t shake it enough
● the stain is way too old and now can be considered a part of the bottle / flask… umm, too late, buddy.. lol!
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