Delete all glyphs and Labels from a figure?

For performance reasons where I am rendering 100s to 1000s of frames in bokeh and exporting to png for later composition into an animation which is all working as a tool chain in general, I would like to flush all existing glyphs from the figure instance and reuse the base figure for composing the next frame.

Basically I want to avoid any overhead per frame of the base figure substantiation and inclusion of a background image.

I am only currently plotting in multiple patch and Labels each frame which I want to flush and then render the next set.

Is there any way to flush out / delete pre-existing glyph / Label annotations