The only accessible showers at CDG are for travelers in business or first class. If this is your case, then your flight company will give you access to a private "salon" where there are showers. The other salon accessible for other travelers is in Terminal 1 and is called Salon Icare but there aren't any showers there. However there is a massage/relaxation service at CDG (this does not replace a good shower I'm sure) look at this webpage: http://www.aeroportsdeparis.fr/ADP/e...e-relax-shops/