Kitchen and bathroom tiles have to have black shifts

If there are black spots in the newly renovated ones, it means that the quality of the tiles is problematic and is defective.

If there are black spots in the old decoration, it means that the oil stain has penetrated, the quality of the tile is not very good, the permeability is high, and it belongs to the ordinary porcelain brick (gypsum bottom), and the vitrified brick cannot have this phenomenon.

If there are tea, coffee, beer, ice cream, grease and other pollutants attached to the surface of the tile, it should be scrubbed in time, if necessary, use sodium hypochlorite dilution (bleach), soak for 20-30 minutes and wipe it with a cloth; Some stains that have been infiltrating the brick for a long time can be soaked for several hours. Ink, cement and other pollutants can use diluted solutions of hydrochloric acid and nitric acid, while paint, paint and other pollutants are best used special cleaners.

The quality of the bricks is not good, such as sprinkling.

If you don't wipe it at the time, it's likely that it will be printed into the brick the next day and won't be wiped off.

You go and find some fine sand, put it on the spots, press and grind it with something soft, and when the grinding is finished, wash it with a wash, and it won't hurt the tiles.

I wash it with the degreasing stain.