/cleanchests reload - reload the plugin config
/cleanchests addItem - add the item in your hand to the config list
/cleanchests - remove all the items specified in your config from the chests of the loaded chunks

I also set the action of the /cleanchests to the

Code (Java):

ChunkLoadEvent

which allows you to "modify" the chest loot by removing some items

Example:
Wanna remove the moss from the shipreck? Just add this item using the /cleanchests addItem (while holding the moss in your hand) and then everytime you go in a shipreck, it will remove this item from the chests