How to Decorate/remove Decorations on Neighborhood maps?

I'm trying to understand the question... My first thought is that I'd suggest this:
1. Open neighborhood decoration mode.
2. Pick up a decoration you want to remove.
3. Press delete key.

If I see the words neighborhood decoration, I'll imagine these are trees, effects, rocks, etc (water towers, crashed UFO's), everything that's not on any lot.
I really don't get the difference between removing and deleting here...

Oh um well when I meant not deleting something, I meant like not thrown in the trash can icon at the bottom. Sorry for the confusion. :(

Thank you though, your suggestion helped a lot! :)

Ah, I see. Custom content can be deleted with that trash can icon. Thanks for explaining.

So yes, delete key. That's also a quick way to sell objects in buy mode.

Glad I could help!