Sometimes the seams between the tiles look as if they will be impossible to clean.
But this is a false impression.
If you choose the right product, you can remove even the most impressive layer of dirt.
You will need to take three large spoons of soda ash. Regular soda will do, but it is not as powerful. Then pour in the oxygen peroxide.
There are no exact proportions, so focus on the consistency. When the product begins to resemble a gel, you do not need to pour in more hydrogen peroxide.
After this, we distribute the prepared composition over the surfaces of the seam using an old toothbrush and wait.
It will take about half an hour.
However, do not go too far. As soon as you notice that the composition begins to look dry, it is worth spraying it with pure hydrogen peroxide from a spray bottle.
Afterwards, you can safely start washing the seams with the same old toothbrush. Then, remove any traces of the cleaning agent with a damp, clean cloth and wipe the seams dry.