Delete generated surface in Revit

Hi, started trying Dynamo to see what I could do with that. So I used a tonurbssurface from a surface, saved my file and closed dynamo. But now I can’t seem to select/delete the surface anymore from my Revit file, how can I delete it?

Close Revit and open it again.
When you want to run the Dynamo script again, right click on the node that generates the surface and turn off “Preview”.

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Ok, thanks!