Modern derailluers don't have to be degreased - no solvents have to be sprayed on it. They don't need to be lubed unless it is overhauled. Just remove the cage inner plate and clean the pulleys. Bushing type pulleys can get a drop of chain lube.

Cassettes and chains should be removed for cleaning.

Wipe the front chainrings with a rag.

That's all.


-Tim-