[Maya] Cleaning up topology / removing unused vertices?

I just made a model in ZBrush and need to finish it in Maya. The model, however, has waaaay too many unused vertices. There are a lot of completely flat fields covered with hundreds of vertices that have no use whatsoever.

I know there's a Clean Topology function for Subdiv Surfaces. Is there something like this for polygon meshes?

I tried Merge, but that just merges all the selected vertices into a center point. And I can't really do it by hand, because the model is way way too detailed. It was my first ZBrush model and I kind of overdid it on the Divisions.

Does anyone know about a function or plug-in to do this? It sounds simple: compare the x,y,z of vertices and if they are a completely flat surface, delete the edges/vertices between them to make a clean square.



I haven't done UV Texturing yet so if that messes up it's np.



I'm pretty sure I could delete half the vertices if there was a function or a script or...