And if you have it available, add perfectionist to neat, and then every time you take your eyes off them that Sim will be off to tidy up, however they too will pick up books you left out for display, and I imagine they might clean up your nectarty, but I haven't installed WA yet so I don't know that for sure.
Have you tried locking your nectarty door(s)? I don't play with maids, so I don't know it will work, but it's a thought at least.