Pioneer DVR-640H Remote

I own a DVR-640H which continues to provide me with outstanding service.

Recently however, my young daughter spilled some fruit juice on the remote control.
We cleaned it as best we could at the time, and whilst it still operates perfectly well, the buttons have become a little sticky and I would like to take it apart to clean it more thoroughly. (I have done this with numerous other remotes in the past).

The problem is that I cannot see how to easily disassemble this remote. It does not appear to be constructed in a fashion similar to those I have looked at previously, and I don’t see any obvious screws holding the two main case parts together.

I’m inclined to think that they can simply and carefully be eased apart but I’m not sure.

Does anybody have any experience with this please ?