now playing the generation Bb and I get clogged up after half an hour, I guess this is moisture.
then I cannot continue playing notes well (so said) what do I do about this problem?
berti
Cover the window with your finger and blow hard…
One thing you can do is dunk the mouthpiece in a soapy water solution, then let it dry. This usually stops the clogging (something to do with the soapy membrane that forms in the inside of the airway), but it doesn’t last very long. YMMV.
On the up side, most modern (expensive) whistles don’t have this problem. Look for whistles with curved windways, and/or delrin/plastic windways.
Two things – cover the window of the fipple and blow through the whistle. You can also hold the whistle by the fipple and kind of shake the moisture out. (Not recommended when there is an audience present 
)
Just shake or point it in the general direction of the bodhran player. They appreciate the extra moisture. 
Please delete the duplicate post before people start replying to it…
In addition to the soapy water trick, warming the mouthpiece well before playing will help. Just hold it between your hands until it’s around body temperature.
Redwolf