Originally Posted by
FBinNY
I find it inconceivable that any kind of wet weather riding could flush grease out of a thread.
+1 Even if you ride with the bike submerged, I don't see how any decent grease would be washed out of threaded fittings. I've also got a rain bike and the threads, either greased or wrapped with Teflon tape (bottom bracket) never show any corrosion.