The yellow stripe appears from hard water.
Even if you clean the toilet regularly, there is still a risk that such a problem will appear and spoil the appearance of the plumbing.
But how to get rid of plaque?
There is no need to spend money on expensive products. You can make an excellent solution yourself in just a couple of minutes.
For ideal cleanliness of plumbing, mix acetic acid (200 ml) and regular dishwashing detergent (1 tbsp). The solution should be stirred carefully, but it should not be foamed.
The resulting liquid should be applied to the entire inner surface of the toilet and left for at least an hour. It is important to close the lid.
Then simply rinse the product off with water.
As a result, the plumbing will become snow-white again, and there will be no trace of bacteria. It is enough to use this product once every two months to maintain cleanliness.