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Pour a handful of rice into a thermos and add a little salt to the cup. Then add half a cup of warm
water and cover the cup lid. Shake vigorously for two minutes. With the help of the impact force of the rice bottle
wall and the starch content inside the rice, it can quickly soften oil stains and remove stains. The insulation cup can be cleaned thoroughly, and the effect is very good.
When shaking, pour out the water directly, and you will see that the water inside has become dirty and turbid. Next, rinse the insulation cup clean with flowing water.

The next step is to start cleaning the cup mouth again, and at this point, you need a toothbrush and
toothpaste to help. Firstly, squeeze the toothpaste onto the toothbrush, and then vigorously brush it.
The cleaning ability of toothpaste is very strong, and it can have a good polishing effect on the stainless
steel cup mouth. At the same time, the bristles of the toothbrush are very soft, which can increase friction
and quickly remove dirt from the cup mouth. If it's not clean once, you can do it again.