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Depending on how much fungus is there on the lens, different techniques are used to remove it during cleaning. You need to understand that to access the interior of the lens, it is disassembled into its individual components, such as the front and rear elements, the aperture assembly, and the focusing helical. So it’s a delicate and serious process.
Also, if the issue is severe, ultrasonic cleaning is done which may remove some of the lens coatings, as the high-frequency sound waves can agitate the cleaning solution and cause it to penetrate the lens surface. And this may impact image quality.
So to cut the long story short, avoid it 😉