Shed Rubs

What does everyone keep in their enclosure for the BP's to rub on during shed?

I don't add anything extra to the enclosure for shed just up the humidity 2 of my snake shed inside thier hides and must just rub inside them :)

I also don't keep anything special in their tubs. Just their water dish. Oh, and they're in a rack. I have watched them shed by rubbing against their own bodies in a circular motion. They always have complete sheds so I leave them be.

They need nothing in their enclosure to rub off their shed, if the humidity is high enough.