What happens if you find Slebne before you can see it?

It also leads to some very comic scenes in which they meet up with a God "You can't come in here wearing that! It clashes with the colour scheme. Have you looked at yourself recently? Go and wash" Only for it to follow some time later by a repeat performance, because the water and soap of Creation does not know Slebne, and so, it will not be washed away by something which refuses to acknowledge its existence.

Or for the B5-esque moment, in a perfectly innocent voice, "Did you know you have Slebne on you?" which isn't quite as good as the "Did you know you have a Vorlon inside of you?", but it approaches it.