In addition to warming the recorder to your body temperature make a swab for the windway by using the tubing from a toilet paper tube.

Cut the tube slightly narrower than the windway, with the length plenty long to be fully inserted plus a couple of inches going beyond the top of the recorder. The cardboard acts as a wick and quickly clears the windway. The cardboard will have a slight bend, which works perfectly for the curved windway of the recorder.

It is NOT recommended for wood instruments as the cardboard will be slightly abrasive on the wood.

Good tip.....it works !