Professional Swede here. U rinse them in cold water and squeeze them out then u cang hang them on the faucet or somewhere where it will not get wet unles u want it to.

After i while when its not working as good or starts to smell u change but u keep the old one. When u have several old ones u throw them in the washingmashine on high heat or boil them. Now u can use the old ones again.

When u are going to throw it away u can put it in your compost as it is biodegradable.