if theres any loose like matter a scourer (not stailess wool - too harsh) will get the majority of junk off then once shes clean fill her up with water and boil for an hour, this will give it an oxidation thingy layer(the pot will take on a brown tea like colour). from there your good to go. other things to do, soak it in napisan overnight to get rid of any organic matter. starsan as an acid wash..