In the course of development I added and removed numerous objects and finally created a new site by duplicating an existing one (to keep the template look) and then removing pages and elements.

But when exporting the new site to an empty folder I find tons of pictures in the gallery and under images that are not part of the current website as well as replaced background pictures.

How can I clean out all this MB-eating garbage? (see https://bizgraphic.ch)