In all the years I have worked on bikes and the hundreds of chains I have cleaned and serviced, and the hundreds more I have sold I have never heard of leaving the factory grease on and just wiping off what accumulates on it. Those who live in central Tx. can attest if you heed the Campy advice you might as well zip tie your chain to your stay with sandpaper and ride that way.
Citrus degreaser will not hurt a chain in any way nor will bike chain lubes. If so you have no buisness riding with those products.