I'm trying to create a 3D model of a house based on a floor plan provided in .dwg format. However, the layers within the .dwg file are really messy and poorly named, and some elements are split into 2 or more layers. This way, manually deleting non-important layers (the ones containing furniture, texts, doorways, etc) can lead to deleting some pieces of walls, for instance. And fixing those things up manually in SketchUp is really time-consuming.
As an example, consider the floor plan below.
So, is there any software, plugin, or script capable of automatically/magically recognizing which parts of the floor plan to keep and which ones to delete/ignore, so I end up with solely the elements needed to make an extrusion in any 3D package? I'm currently using SketchUp and 3DS Max, but any other software that can solve this issue would be more than welcome.