Howlite is a relatively soft stone that prefers gentle purification methods. It is advisable to use fumigation (white sage or palo santo) to delicately cleanse its energy. A quick rinse under clear water is possible, but avoid prolonged soaking.
To recharge, expose your Howlite to moonlight, especially during a full moon, to restore its gentle energy. You can also place it on a cluster of quartz or an amethyst geode for a few hours to allow it to regain its full vitality.