Originally Posted by rumrunn6

I use my water bottle when I get to work, and sometimes use a second. But I haven't done this in a while - it depends on the circumstances and the weather/temperature. Also it's been less necessary since getting fenders. However when I get home I still keep and eye on the drivetrain because even with fenders the drivetrain picks up a fair amount of road debris. I got a sweet bottle brush for cheap that has been very handy, and it is very stiff which helps. It looks like this one:

http://www.stacksandstacks.com/cleaning-brush