I road in some snow for about an hour and a half a few weeks back on my mtb. At some point in the ride I looked down and noticed my front derailleur (Shimano Deore) and small chainring were completely covered in snow. When I got home I knocked the snow off with a brush but did not lube. Next ride I could not shift into the small chainring. I took it to the shop, they took the derailleur off, cleaned it and lubed it and said if it still doesn't work to get a new one. Has this ever happened to anyone? Can anyone explain where you are supposed to lube the front derailleur after a snowy slushy ride?