My BB doesn't have a drainage hole built into the frame....what it does have is a screw hole for the cable guide. Apparently I need to take that out to let it drain.

Thank you for the replies. I am, however, still interested in what I can do as far as regular maintenance. I need to clean the chain and chainring. The only way I know how to do this is solvent. Any suggestions?

MichaelW, yes the BB cartridge is supposed to be sealed and unmaintainable. But then how did they open it up, find rust, clean it out and relube it? Something I will have to ask when I go by the LBS to pick my bike up this afternoon.