One traditional way to "clean out" snails is to leave them to eat a diet of nettles for at least 24 hours.
You must cook them fully before eating them; I remember several stories of teenage boys in Australia eating raw slugs or snails for a dare, and contracting parasitic meningitis.
Although there is less risk of catching the worm in Europe, the risk may well rise in the future, and is already a problem in much of S.E. Asia and parts of the southern USA.
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