I thought this write-up was interesting re cleaning and lubing your bike:

http://sprinterdellacasa.blogspot.co...your-bike.html
(scroll to the "Detailing Your Bike in 30 Minutes or less")

I don't know if I agree with every little step he suggests (especially not to the using WD-40 as a lubricant), but some of the ideas are useful. For instance, making sure you don't use your main sponge on the chain!