Remove material from component surface?

I’ve assigned a material to a component surface. Is there a way to remove it again?
If I go to properties > material icon, and choose ‘by parent’ or ‘by layer’, the whole object gets this material.

Hi Eugen -

If I understand this correctly, the RemovePerFaceColors should do that.

Thanks! Learned something. However, this command removes all per face colors (materials) of a brep. Is it possible to remove them for only certain faces, too?