Originally Posted by
Bezalel
Make sure your steerer isn't filled with debris, water shoud drain out by itself.
A lot of all-carbon or carbon with metal steerer forks have a solid bottom to their fork crown so any water that gets into the steerer can't drain. Also, some headset top caps have an open hex hole to accept an allen wrench for preload adjustment or have a poor seal around the top cap's preload bolt. Either can admit water.