The tiles in the bathroom have been used for many years, and there is some dirt on the brick surface

This situation is mainly limescale, rust, soap scale, ash scale, etc., which are formed after a long time, and if you take a shower in it, there will be human oil stains. This mixed stain is indeed more difficult to remove. The methods of those upstairs must not work, and if you don't believe the landlord, you can give it a try.

I recommend 2 products to you, the brand is the shield king, one is the all-effect decontamination king, the other is the descaling king, the descaling king removes scale soap stains and human body oil and ash is very good, and the descaling king removes scale and rust The effect is very obvious. With these 2 products, you can basically solve your problem, if the crevices are also black and yellow, also use the descaling king to clean.

There is a cheap sewage removal method, which is very corrosive, which is used to decontaminate toilets.

It's kind of like sulfuric acid or something.

Use oxalic acid, the price is cheap, hit a bucket and sprinkle it on the ground, soak it for a while and rinse it with water, you can also brush it with a brush, and you can do it a few more times.

How about trying Mr. Wittmann? Spray the solution on the area that needs to be cleaned, then take the old newspaper and wipe it slowly, and when the dirt is reduced, wipe it with a clean damp linen cloth, and the effect should appear in front of you immediately.

You can use a clean rag dipped in some old-fashioned decontamination powder to wipe hard, do not wipe with steel wool balls, otherwise the protective layer on the surface of the tile will be wiped off, and the tile can only be changed in the future, and after wiping with a soft cloth, a transparent waterproof layer is coated on the surface of the tile, and it will not be black again in the future.

It can be removed very clean with solid powder, and it only costs five or six yuan for a bottle on the market.

It is nothing more than some water-stained deposits containing calcium and magnesium ions, which can be disposed of by ordinary toilet cleaners with weak acids.

Try putting a wire brush on stockings and washing with toilet cleaner or hydrochloric acid. This is a method that is seen on bus TV, and it is said to work.