You are right. This type of vegetable needs more time to wash. Must be careful. Leeches like to hide in them. I always use salt n flour to wash veggies. Salt to kill off parasites n flour to absorb n wash off those dust that settles onto the veggies leaves. I wash my fruits like strawberries, blueberries n other berries in this way too. Give me peace of mind to consume them. This soup you made is delicious n nutritious. Good Job.