With regard to washing plates, it is sufficient to wash them well with whatever will get rid of the filth of this meat.
Because the correct view is that the impurity caused by pork is like any other impurity; there is no need to wash it seven times, one of which should be with earth.
See al-Sharh al-Mumti’ by Ibn ‘Uthaymeen, 1/356. And Allaah knows best.
Islam Q&A
Sheikh Muhammed Salih Al-Munajjid