I went to the Campagnolo site, and from their own technical information viewable at:
http://www.campagnolo.com/pdf/140-cat9V-2000.pdf
They say:
MAINTENANCE: Avoid using solvents. Clean chain regularly with a dry and clean cloth; lubricate with chain oil for bicycles.
ATTENTION: Avoid removing chain, if not for final replacement with a new one.
Shimano says to use a neutral detergent and not to use alkali-based or acid based detergents such as rust cleaners...
http://bike.shimano.com/product_imag...CN_7701_SI.pdf