I rinse with warm water..reed side up to make sure water gets between reeds. Then put in an Altoid tin with sponge that has diluted Scope mouthwash and put in fridge during the season. I try to do this after every hunt, but forget a lot of times. I like to keep the calls cold and moist to keep reeds from sticking together.
After season I rinse and put in Margarine contain and cover with water then freeze. Got calls 10yrs old good as new. I still buy new ones every yr just to see how they sound.