They showed the beginning of the Head of Household competition yesterday, which involves them standing inside hot dog buns while being squirted with condiments on their whole body. The rest should air on Sunday.

I can't find any videos, but http://www.cinemablend.com/television/1695989/big-brother-19-live-feed-spoilers-who-won-head-of-household has a couple pictures that show the setup (but not much mess; I guess they periodically hosed them off with water).

Haven't seen the edited footage

but the "live: footage gave us the best imagery the show has had in a long long time

I just watched it, none of them were attractive IMO