Oddly enough, but the author of this advice is a girl. But not just a girl, but a scientist girl, and her husband is also a scientist. So they came to this issue on a scientific basis.
First, they took apart the cassette with knives. When removing knives, it is important to put them in the same cell from which they were removed. The knives are ground with nets, and rearranging them in places will worsen the operation of the razor.
And carefully examined the knife. Each section of the knife, as it were, consists of two halves, one above the other. The first blade grabs and raises hair, the second cuts off.
Then they enlarged the image 400 times and saw fine particles of metal on the surface of the knife. In general, the knives are self-sharpening on the net, but the particles still remain and prevent hair cutting.
After evaluating the information, they came to the conclusion that knives cannot be sharpened. The most effective way is to clean them. Moreover, you need to clean so that the slot between the knife blades (two halves) is not clogged.
An excellent result was shown by ordinary toothpaste. Put the paste on the palm of your hand, turn on the razor and press the net to the palm of your hand. Thus, it is necessary to achieve complete cleaning of the knives and mesh.
After cleaning, rinse the cartridge with warm water.
According to the author of the council, the husband was pleased with this cleaning. Of course, this tip is only suitable for rechargeable wet shaving razors, but other razors can be cleaned manually with toothpaste and a brush.