On a related note, what's the best way to clean a chain that has picked up a lot of sand/grit? During the winter the city spreads sand on the roads when there's snow and ice, and then this stuff often doesn't get swept up in the spring. This results in riding through a lot of sand and gravel, and I have noticed (when putting it back on the other day after it got thrown off the chainring when shifting to the lowest gear in front) that my chain is rather gritty which is probably not such a good thing. What's a good, easy way to get most of the sand out?