There are a few things you can do to clean a beard. The first is to shampoo it. Shampooing will remove any built-up oils and sweat, which will help keep your beard looking clean and healthy. Next, use a beard brush to groom your beard. This will remove any build-up and make your beard look more groomed. Finally, use a mild soap to clean the inside of yourbeard using circular motions. Be sure to rinse off completely after each use.