PRORASO Pre/Post in the Shower Question

I noticed a number of B&Bers like to apply a bit of the PRORASO Pre/Post before they get in the shower in the morning, so I gave it a try. Wow! It feels pretty great in the steam and such, but I've got a question.

Should I just leave the Pre/Post on during the entire shower, or should I wash my face with a facial cleanser/soap to get rid of it? I've been washing my face in the shower and thus removing the Pre/Post, but I'm thinking skin oils and moisture wise I should leave the Pre/Post during the whole shower.

Thoughts?

I put it on about 5 minutes before I shower, then I just do my normal routine and shave right over it, since I wash my face last. It definitely improves my shaves, personally. Don't like it afterward; it feels greasy to me.