Did mine today. Thanks again @Jayw13702
Was very little in there to remove. I highly doubt it's been done by anyone else or a dealer, so it must just be clean!
Tip for anyone else doing it. When removing the three clips from the side trim, don't let them shoot / fly out. I lost one underneath the hybrid battery. The better thing to have done would to have removed those before removing the false floor and exposing the battery. Hope I don't get rattles and knocks, I didn't bother retrieving it.
What I did find was a few drops of water / few dozen tiny little stones (road / dirt / debris) near the Mark Lenvinson amp (mounted flat underneath the motor). There's a small white vent with a one way flap to the right of that, which I assume is the way it's getting in. Not sure what the inlet is for. But was not what I wanted to see. Dried it and vacuumed it out. Looked like it might be getting to the vent via the wheel arches.