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I know ... you have the doubt that a dirty disk can dirty or even ruin your drive. E avete ragione! Ecco come pulire i floppy da 3.5".
Through this tool that RetroManiak gave me, we can control both sides of the magnetic disk: they must not have round stains. Those are moldy and can damage the drive.
If you find such stains, I would not use the floppy disk, unless there is extremely important data.

Poi puliamo entrambi i lati del dischetto magnetico tramite un morbido panno in microfibra. Mi raccomando, delicatamente! Si può utilizzare anche un panno in cotone. L'importante è agire delicatamente! Bisogna soltanto spolverare entrambi i lati del dischetto magnetico, senza sfregare troppo. Ecco come pulire i floppy da 3.5"!

You can now insert the floppy disk into your computer, without fear that dirt will ruin the drive.
La stessa procedura vale per i dischetti da 5.25", ma esiste un attrezzo diverso.
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Thank you!
