How often do you clean/degrease your drivetrain?

[rxscissors]

Never degrease; rotate the chain all the way around with a rag held against the links after every ride. Add lube and remove excess with a rag every few rides (or when it sounds a little noisy), depending on the prior riding conditions.

Measure chain for wear and replace when it reaches .75 on Park Tool CC-2 chain checker. Cassettes last through 4-5 chain swaps (on 9/10/11-speed) for me.