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I use coconut oil, its natural and safe. People use swazerga or however you spell it but i find coco nut oil works just as well! Use a small tooth brush or other similar object to brush in the coconut oil and brush away and yucky stuff. Hope this helps.
Edit I do not know about E45 but heard washing up liquid does work, probably not as safe as coco nut oil though, but not dangerous by any means. It can dry their skin out also.