There should be 0 smell once you get done cleaning. I use chlorexidine and water mix to clean my tubs. once I'm totally done the whole room smells like it no poop what so ever..
If your smelling something funky then there's either something your missing or.. the enclosure has been soaked with "Whatever" and so no amount of cleaning will ever get it out.
As for Febreeze.. I'm not willing to risk my animals with it but that's up to you. My vote is no!