# How to clean rendering window in Qt (PySide2, Qt5)
**URL:** https://discourse.vtk.org/t/how-to-clean-rendering-window-in-qt-pyside2-qt5/1217
**Category:** Support
**Created:** [June 26, 2019, 12:38pm UTC](https://discourse.vtk.org/t/how-to-clean-rendering-window-in-qt-pyside2-qt5/1217 "2019-06-26T12:38:58Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@sbucc](https://discourse.vtk.org/u/sbucc)
#### Post date: [June 26, 2019, 12:38pm UTC](https://discourse.vtk.org/t/how-to-clean-rendering-window-in-qt-pyside2-qt5/1217/1 "2019-06-26T12:38:58Z")
I’m writing a viewer with python 3.5 and Qt5, using PySide2.
How do I completely wipe or unload the existing mesh from a rendering window? I just want the existing mesh to disappear when I click a button.
I’m rendering into a QVTKRenderWindowInteractor widget, I tried setting the actor to None, and other things that frankly I can’t remember, and nothing worked: either the last loaded mesh stayed stubbornly in the window, or else the window went black and I couldn’t load a new mesh.
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### Author:  [@cory.quammen](https://discourse.vtk.org/u/cory.quammen)
#### Post date: [June 26, 2019, 3:28pm UTC](https://discourse.vtk.org/t/how-to-clean-rendering-window-in-qt-pyside2-qt5/1217/2 "2019-06-26T15:28:48Z")
It sounds like you might need to remove the actor from the renderer with `vtkRenderer.RemoveActor(actor)` and pass in your actor object before setting it to `None`. Just deleting the actor isn’t sufficient because the renderer will hold a reference to the actor object.
To completely clear the renderer, you can call `vtkRenderer.RemoveAllViewProps()`.
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### Author:  [@sbucc](https://discourse.vtk.org/u/sbucc)
#### Post date: [June 26, 2019, 8:54pm UTC](https://discourse.vtk.org/t/how-to-clean-rendering-window-in-qt-pyside2-qt5/1217/3 "2019-06-26T20:54:49Z")
@cory.quammen, RemoveAllViewProps is exactly what I was looking for, thanks!