No, unplanting the plants is unnecessary. I have a planted Vivarium for my two american toads, and when I clean it, I just remove all loose objects (rocks, logs, etc.) in your it would be vines, branches, etc. and lightly loosen up the soil around the plants with an old fork, clean any fecal matter I may have missed the previous day (I rarely miss it, as it stinks pretty bad, so it's hard to miss ), clean the glass, then rearrange a few things, and your ready to put everything back in.

~Royce