Howlite is a calming stone that enhances positive properties. Howlite helps you to be less critical and improves your patience and memory. It works well against stress, worrying and insomnia. It provides insight and helps you to keep control over your own life. It calms intense emotions like anger.
Howlite is water resistant, but only for short periods of time. This is why it's not recommended to cleanse howlite with water. With that in mind,it can be cleansed and charged in every other way. Here I explain more about cleansing and here about charging crystals. :)