Really sweet looking body on that girl. (That actually sounds wrong LOL!)
Anyhow, I've had that same EcoEarth issue. I put paper down to prevent it occasionally but somehow they find a way to drag the rat/quail or habit off the paper.
A little doesn't hurt them, but when it gets packed in there like you had to deal with, I agree it is best wash it out.
I have two Rio Bravo Pokis not far from me and if they ever breed I may join your club.
Love your boa and really like picture 3.