I have six nebs, and I only use each one once after I boil them. Immediately after each use, I wash my neb with dishsoap and let it air dry. Then, after I've used all six of them, I boil them all at once in a big pot with the lid on for 15 minutes, and I let them air dry in a dish rack that is used ONLY for boiled nebs. So i only have to boil them every 3 days, which is nice.