1. Put the snails into a bucket, stir quickly by hand, and wash with clean water 2 to 3 times.
2. Put the cleaned snails into a bucket, add water, and then add a small amount of salt (a little is enough).
3. Put rapeseed in the bucket. Just make sure there is a thin layer of oily flowers on the water surface. The mud and sand will be vomited in about 2 hours.