Remove everything from a Canvas3D

Is there a way to remove everything from a Canvas3D? I am having real problems because if my application ( which only needs to use Java3D a few times ) has two Canvas3D objects in memory at once it starts making a mess of the screen around the application.
The solution as I see it is to maintain a single Canvas3D object but remove everything from it when I am done using Java3D- how can I do this?

That didn't sound helpful at all until I remembered that the viewplatform was a branchgroup too, then it sounded quite helpful. The only other thing I had to do was to remove the canvas from the view.
Viewer[] ox = ourViewingPlatform.getViewers();
for( int p=0;p<ox.length;p++)
  ox[p].getView().removeAllCanvas3Ds();Worked a treat.

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