My newest Norelco is designed to be rinsed clean, but I'm not sure if it's definitely designed to go into the shower or be used with shaving cream or the like. I haven't changed from my usual pattern of dry shaving after the shower.

I looked up the manual. It suggests best results are with a clean, dry face. So even though this unit rinses clean, it probably isn't a good idea to shave wet or in the shower. (This only refers to mine, one of the Norelco SpeedXL models.)