Deleting all UV-sets?

Hello, I have a quick question. I am working with leveldesign and I have combined the rocks together, some of them is without textures after combine.

I try to change their uv set to fit into the right uv set. But right now it is a mess and I am trying to delete all these UV set like deleting unused nodes like in hypershade but it seems it doesnt work that way.

Any suggestion or help, how to get rid of the UV set in UV texture editor?
I checked the Maya help but couldnt find any help of it.