A customer contacted us about a problem with his drawing as the drawing only had about a hundred heads but was 32+ megs. It turns out that the drawing had a large number of DGN Linetypes, and these really bulked up the DWG file. Before we got to dig too deep into the problem, the customer contacted us again and told us that he discovered that AutoCAD has an option built into the PURGE command to eliminate these. The option is the 'Automatically purge orphaned data' option in the PURGE dialog.
This reduced this particular drawing to less than one meg and prevents further problems with 'junk' data from DGN files from coming back as background details get copy and pasted into the drawing.
AutoCAD 2013 and 2014 do not have this command, but Autodesk has created a fix that removes these:
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