You think the cleaning staff would mind?

[kresty]

It's gotta be some sort of "tilt truck" though....  eg: https://www.bing.com/images/search?q=til...uck%20cart

Some of them have external frames/wheels, so the bucket part would be easy enough to pull out.  And there are 3 ridges along the front like the molds of several brands.  The catch is that the "nose" is tilted out, whereas most of the others seem to be more vertical if anything.

Mouse Train and Monster Mouse Droid (aka Imperial Treadwell)