Great question — answering as the UphillTech team:
The soaking in hot water is typically to deal with oil that's congealed inside the mister after use. Soap shouldn't have the same problem unless you were using bar soap. There are two main things that can go wrong : The vessel won't pressurize The pressurized vessel won't spray. First, we need to figure out which one it is. To check pressurization: Fill the container half-full with liquid (oil or water). There might be a 'max fill' line (I haven't used a misto in over a decade), but if there is, you'd likely need a flashlight to see it well. Reassemble the mister. Make sure the ring around the top is tightened down well. After it spins down freely, you want to try to get it another quarter...
Full answer by Joe: https://cooking.stackexchange.com/a/77498 (CC BY-SA 3.0).
Need it done for your business? UphillTech.
