the problem is the egg , it has an adhesive like layer around itself that made it attach to surfaces an effective way to separate it from surfaces is to let vegetable soak with water mixed with some detergent like washing powder or dish washing liquid in a bucket for 20 to 30 min then slowly remove it and wash the vegetable with alot of water .
it help remove the parasite egg . after that to kill bacteria like E-coli you must wash the vegetable with an Anti-Bacterial agent which are usually chlorine based like Perchlorine (which again is probably hard to come by in a country like north Korea)