Reply To: Possible Clogged Spit Valve
The spit valve is a spring mechanism. Not complicated at all. When you attempt to blow (Without pushing any keys) you will feel resistance. Next, push the spit valve, and you will sense the change that air is escaping. You may not feel the air stream where you are holding the melodica, but the lack of resistance will tell you that you are clearing the instrument.
A nearly new instrument should not need cleaning unless you’ve been eating and drinking while playing.
Good luck and welcome.