If you’re looking to clean moss for your terrarium, there are a few things you’ll need to do first. Wet the moss and then use a brush or your fingers to remove any dirt or dried leaves. Next, pour some water into the pot and place it on the stove. Once it’s boiling, turn off the heat and let the moss soak for about 10 minutes. After that, use a spoon to remove any excess water and blot dry with a towel. Finally, seal your terrarium with glass or plastic and enjoy your clean moss! ..